18400256 has 88 divisors (see below), whose sum is σ = 44804736. Its totient is φ = 7372800.

The previous prime is 18400247. The next prime is 18400301. The reversal of 18400256 is 65200481.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121781 + ... + 121931.

Almost surely, 2^18400256 is an apocalyptic number.

18400256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18400256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22402368).

18400256 is an abundant number, since it is smaller than the sum of its proper divisors (26404480).

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

18400256 is a wasteful number, since it uses less digits than its factorization.

18400256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 18400256 is about 4289.5519579555. The cubic root of 18400256 is about 264.0024487070.

The spelling of 18400256 in words is "eighteen million, four hundred thousand, two hundred fifty-six".