Four hundred
400 is an even number.
400 is a Harshad number, which means it is divisible by the sum of its digits (4 + 0 + 0 = 4, and 400 is divisible by 4).
In binary, 400 is represented as 110010000.
In hex, 400 is represented as 190.
Prime factorization of 400: 24 * 52.
Factors of 400 are: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400.