14

14 is the natural number that comes after 13 and before 15. It is an even composite number and the product of the primes 2 and 7, making it a semiprime. The divisors of 14 are 1, 2, 7, and 14; the sum of its proper divisors is 10, so 14 is a deficient number.

In base representations, 14 in decimal is written as 14; in binary it is 1110, in octal it is 16, and in hexadecimal it is E. In Roman numerals it is XIV.

In science, 14 is the atomic number of silicon, a metalloid that is the second most abundant element in the Earth's crust. Silicon is central to modern electronics and photovoltaics. In geometry, a tetradecagon is a 14-sided polygon.

In culture, February 14 is widely celebrated as Valentine’s Day in many countries. In mathematics and astronomy, M14 denotes a globular cluster cataloged by Charles Messier.

Etymology: the name fourteen comes from the Latin quattuordecim, formed from quattuor ‘four’ and decem ‘ten’.