16400256 has 32 divisors (see below), whose sum is σ = 43564200. Its totient is φ = 5466624.

The previous prime is 16400233. The next prime is 16400269. The reversal of 16400256 is 65200461.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20971 + ... + 21738.

Almost surely, 2^16400256 is an apocalyptic number.

16400256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16400256 is an abundant number, since it is smaller than the sum of its proper divisors (27163944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16400256 is an equidigital number, since it uses as much as digits as its factorization.

16400256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42726 (or 42714 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 16400256 is about 4049.7229534871. The cubic root of 16400256 is about 254.0681405213.

The spelling of 16400256 in words is "sixteen million, four hundred thousand, two hundred fifty-six".