14 (fourteen) is the natural number following thirteen and preceding fifteen.
Mathematics
Fourteen is a composite number, its proper divisors being 1, 2 and 7.
In base fifteen and higher bases (such as hexadecimal), fourteen is represented as E.
This number is the lowest even n for which the equation φ(x) = n has no solution (see Euler's totient function). It is a Catalan number.
Fourteen is a Keith number in base 10: 1, 4, 5, 9, 14...
Other fields
Fourteen is:
- The atomic number of silicon.
- The number of days in a fortnight.
- In traditional British units of weight, the number of pounds in a stone.
- A number 'encoded' in a lot of the music of Johann Sebastian Bach. Bach may have considered this number a sort of signature, since given A = 1, B = 2, C = 3, etc., then B + A + C + H = 14 and J + S + B + A + C + H = 41.
- The number of points outlines by president Woodrow Wilson for reconstructing a new Europe following World War I, see Fourteen Points.
- Among neo-Nazis to signify the "14 words", "We must secure the existence of our people and a future for white children", attributed to David Lane.
- An unlucky number in China because it is homonymous with ???? which means "must die".
- The number of legs on a pillbug, as well as on Hallucigenia.
- The year AD 14.
13 and 15
