See also: Millennium , year 2000 AD, Y2K .
Two thousand is the highest number expressible using only two unmodified characters in Roman Numerals (MM).
Two thousand is also:
Selected numbers in the range 2001-2999
- 2001 - Sphenic Number
- 2003 - Sophie Germain Prime
- 2006 - Current year (Gregorian Calendar)
- 2016 - Triangular Number
- 2017 - Mertens Function zero
- 2024 - Tetrahedral Number
- 2025 - sum of the cubes of the first nine integers, 45^2, Centered Octagonal Number
- 2027 - Safe Prime
- 2030 = 21² + 22² + 23² + 24² = 25² + 26² + 27²
- 2031 - Centered Pentagonal Number
- 2039 - Sophie Germain prime, safe prime
- 2047 - Super-Poulet Number , Woodall Number , Decagonal Number
- 2048 - Power Of Two
- 2056 - Magic Constant of ''n''×''n'' Magic Square and ''n''-Queens Problem for ''n'' = 16.
- 2063 - Sophie Germain prime, safe prime
- 2069 - Sophie Germain prime
- 2070 - Pronic Number
- 2080 - triangular number
- 2093 - Mertens function zero
- 2095 - Mertens function zero
- 2096 - Mertens function zero
- 2097 - Mertens function zero
- 2099 - Mertens function zero, safe prime, Highly Cototient Number
- 2100 - Mertens function zero
- 2101 - Centered Heptagonal Number
- 2109 - Square Pyramidal Number
- 2112 - The break-thru album of the band Rush
- 2113 - Mertens function zero
- 2116 = 46^2
- 2117 - Mertens function zero
- 2119 - Mertens function zero
- 2120 - Mertens function zero
- 2122 - Mertens function zero
- 2125 - Nonagonal Number
- 2127 - sum of the first 34 primes
- 2129 - Sophie Germain prime
- 2135 - Mertens function zero
- 2136 - Mertens function zero
- 2138 - Mertens function zero
- 2141 - Sophie Germain prime
- 2145 - triangular number
- 2162 - pronic number
- 2169 - Leyland Number
- 2171 - Mertens function zero
- 2172 - Mertens function zero
- 2175 - smallest number requiring 143 seventh powers for Waring representation
- 2176 - Pentagonal Pyramidal Number , centered pentagonal number
- 2179 - Wedderburn-Etherington Number
- 2187 - Vampire Number , 3^7
- 2188 - Motzkin Number
- 2197 = 13^3
- 2205 - odd Abundant Number
- 2207 - safe prime, Lucas Prime
- 2208 - Keith Number
- 2209 = 47^2, centered octagonal number
- 2211 - triangular number
- 2223 - Kaprekar Number
- 2232 - decagonal number
- 2255 - Octahedral Number
- 2256 - pronic number
- 2269 - Cuban Prime
- 2273 - Sophie Germain prime
- 2276 - sum of the first 35 primes, centered heptagonal number
- 2278 - triangular number
- 2287 - Balanced Prime
- 2294 - Mertens function zero
- 2295 - Mertens function zero
- 2296 - Mertens function zero
- 2300 - tetrahedral number
- 2301 - nonagonal number
- 2304 = 48^2
- 2306 - Mertens function zero
- 2309 - Primorial Prime , Mertens function zero, highly cototient number
- 2310 - 5th Primorial
- 2311 - primorial prime
- 2321 - Mertens function zero
- 2322 - Mertens function zero
- 2326 - centered pentagonal number
- 2331 - Centered Cube Number
- 2338 - Mertens function zero
- 2339 - Sophie Germain prime
- 2346 - triangular number
- 2351 - Sophie Germain prime
- 2352 - pronic number
- 2357 - Smarandache-Wellin Prime
- 2378 - Pell Number
- 2393 - Sophie Germain prime
- 2397 - sum of the squares of the first ten primes
- 2399 - Sophie Germain prime
- 2400 - perfect score on SAT tests administered after 2005
- 2401 = 7^4 = 49^2, centered octagonal number
- 2415 - triangular number
- 2417 - balanced prime
- 2425 - decagonal number
- 2427 - sum of the first 36 primes
- 2437 - cuban prime
- 2447 - safe prime
- 2450 - pronic number
- 2458 - centered heptagonal number
- 2459 - Sophie Germain prime, safe prime
- 2465 - Magic Constant of ''n''×''n'' Magic Square and ''n''-Queens Problem for ''n'' = 17, Carmichael Number
- 2470 - square pyramidal number
- 2481 - centered pentagonal number
- 2484 - nonagonal number
- 2485 - triangular number
- 2500 = 50^2
- 2501 - Mertens function zero
- 2502 - Mertens function zero
- 2517 - Mertens function zero
- 2520 - Highly Composite Number ; smallest number divisible by all numbers up to ten; Harshad Number in several bases
- 2522 - Mertens function zero
- 2523 - Mertens function zero
- 2524 - Mertens function zero
- 2525 - Mertens function zero
- 2530 - Mertens function zero, Leyland number
- 2533 - Mertens function zero
- 2537 - Mertens function zero
- 2538 - Mertens function zero
- 2543 - Sophie Germain prime
- 2549 - Sophie Germain prime
- 2550 - pronic number
- 2556 - triangular number
- 2567 - Mertens function zero
- 2568 - Mertens function zero
- 2570 - Mertens function zero
- 2579 - safe prime
- 2580 - Keith number
- 2584 - Fibonacci Number , sum of the first 37 primes
- 2600 - tetrahedral number
- --- 2600 Hz is the tone used by a Blue Box to defeat Toll Charges on Long Distance Telephone Call s.
- --- is a magazine named after the above.
- --- The Atari 2600 was a popular Video Game Console .
- 2601 = 51^2
- 2620 - Amicable Number with 2924
- 2626 - decagonal number
- 2628 - triangular number
- 2632 - number of consecutive baseball games played by Cal Ripken, Jr.
- 2641 - centered pentagonal number
- 2647 - centered heptagonal number
- 2652 - pronic number
- 2674 - nonagonal number
- 2677 - balanced prime
- 2680 - number of 11-Queens Problem solutions
- 2689 - Mertens function zero
- 2693 - Sophie Germain prime
- 2699 - Sophie Germain prime
- 2701 - triangular number, super-Poulet number
- 2704 = 52^2
- 2728 - Kaprekar number
- 2729 - highly cototient number
- 2736 - octahedral number
- 2741 - Sophie Germain prime
- 2744 = 14^3
- 2747 - sum of the first 38 primes
- 2753 - Sophie Germain prime
- 2756 - pronic number
- 2775 - triangular number
- 2791 - cuban prime
- 2806 - centered pentagonal number
- 2809 = 53^2, centered octagonal number
- 2819 - Sophie Germain prime, safe prime
- 2821 - Carmichael number
- 2835 - odd abundant number, decagonal number
- 2843 - centered heptagonal number
- 2850 - triangular number
- 2862 - pronic number
- 2870 - square pyramidal number
- 2871 - nonagonal number
- 2872 - Tetranacci Number
- 2879 - safe prime
- 2897 - Markov Number
- 2903 - Sophie Germain prime, safe prime, balanced prime
- 2914 - sum of the first 39 primes
- 2916 = 54^2
- 2924 - amicable number with 2620
- 2925 - Magic Constant of ''n''×''n'' Magic Square and ''n''-Queens Problem for ''n'' = 18, tetrahedral number
- 2926 - triangular number
- 2939 - Sophie Germain prime
- 2963 - Sophie Germain prime, safe prime, balanced prime
- 2965 - greater of 2nd pair of Smith Brothers
- 2969 - Sophie Germain prime
- 2970 - Harmonic Divisor Number , pronic number
- 2976 - centered pentagonal number
- 2997 - Chiliagonal Number
- 2999 - safe prime
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