is an Octagonal Number , and as the sum of the first four Pentagonal Number s, it is a Pentagonal Pyramidal Number . It is a Harshad Number .
Given 40, the Mertens Function returns 0 . 40 is the smallest number ''n'' with exactly 9 solutions to the equation φ (''x'') = ''n''.
Forty is the number of ''n''-queens Problem solutions for ''n'' = 7.
The number 40 is significant in 's flood, the period Moses spent on Mount Sinai receiving the Ten Commandments and the period Christ spent in the wilderness. In modern Western Christian practice, Lent consists of the 40 days preceding Easter .
The dead are usually Mourned for forty days in Muslim cultures. Similarly, some Russians believe that Ghost s of the dead hang around the site of their death for forty days.
is also:
- in the Maxim " Life begins at forty".
- in the expression " Forty Winks ", meaning a short sleep.
- the number of years of marriage as the ruby Wedding Anniversary .
- the Code For Direct Dial International phone calls to Romania .
- the number in the designation of:
- --- Interstate 40 , a freeway that runs from California to North Carolina .
- --- U.S. Route 40 , the 800-mile highway that runs from Baltimore, Maryland , to Vandalia, Illinois , being synonymous with the National Highway .
- --- European Route E40 from Calais to Ridder
- ---the A40 and M40 , important highways in the UK . The A40 is a trunk road in England and Wales , connecting London to Fishguard . The M40 motorway is the second motorway in the British transport network to connect London to Birmingham .
- the title of a Song by U2 .
- The band Crush 40 .
- in the title of the Food Network Show '' $40 A Day ''.
- in the name of WD-40 , a type of spray Lubricant .
- in the name of the food additive FD & C Red Dye #40, commonly known as "Red 40" {Link without Title}
- the 40 Ounce size used for Liquor , typically fairly cheap Malt Beer ; a person sometimes "pours a forty on the curb", i.e., pours out said bottle onto the street, in memory of a person who has died
- number of thieves in Ali Baba And The Forty Thieves from Thousand And One Nights - both numbers (40 and 1001) are more likely to mean "many" than to indicate a specific number
- the number of hours in a regular work week
- the classic Russian Vodka is alcohol content 40 percent by volume
- the year A.D. , 40 BC , or (for example) 1940 .
- The jersey number of Pat Tillman , which was retired by the Arizona Cardinals .
|
