Nine hundred ninety nine
999 is an odd number.
999 is a palindrome.
999 is a Harshad number, which means it is divisible by the sum of its digits (9 + 9 + 9 = 27, and 999 is divisible by 27).
In binary, 999 is represented as 1111100111.
In hex, 999 is represented as 3e7.
Prime factorization of 999: 33 * 37.