| 18 (number) |
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Information About18 (number) |
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IN MATHEMATICS Eighteen is a Composite Number , its proper Divisor s being 1 , 2 , 3 , 6 and 9 . It is a Heptagonal Number , and as the sum of the first three Pentagonal Number s, it is a Pentagonal Pyramidal Number . It is a Harshad Number . IN SCIENCE
Astronomy
IN HUMAN AFFAIRS: AGE 18 In many parts of the world, 18 is the age minimum for being allowed a Driver's License and/or for purchasing Alcohol or Tobacco . It is also the voting age in many countries. During the Vietnam War , Americans could be drafted at an age as low as 18, but were not allowed to vote in most states until they were 21. A movement spread to lower the voting age, and in 1971 , the Twenty-sixth Amendment extended a guarantee of suffrage to anyone 18 years or older in all states. The voting age was lowered from 21 to 18 in the U.K. and many other nations around that time. Eighteen is also the age in most countries at which a person may appear in a pornographic video, if pornography is legal at all, or have sex with a person in a position of authority over them (a teacher, athletic coach, or employer, for instance, or in general anyone else over the age of 18). In addition, eighteen year-olds in America have the right to bear arms, own property, marry without parental consent, get an abortion, donate their body to science, obtain a passport, and serve on a jury. With these new privileges come responsibility: eighteen year-olds are tried as adults in court. See also: 18 Certificate IN JUDAISM In Hebrew numerology ( Gematria ), the word for life (In Hebrew Language "Chai" - חי), adds up to 18. As a result, the number 18 is believed to be lucky, and donations and monetary gifts are often given in multiples of 18. IN OTHER FIELDS Eighteen is also used in = 1 , H = 8 . See also 88 . Eighteen is also:
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