18918256 has 20 divisors (see below), whose sum is σ = 41890672. Its totient is φ = 8107776.

The previous prime is 18918253. The next prime is 18918307. The reversal of 18918256 is 65281981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84345 + ... + 84568.

Almost surely, 2^18918256 is an apocalyptic number.

18918256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18918256 is an abundant number, since it is smaller than the sum of its proper divisors (22972416).

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

18918256 is a wasteful number, since it uses less digits than its factorization.

18918256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168928 (or 168922 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 18918256 is about 4349.5121565527. The cubic root of 18918256 is about 266.4569378729.

The spelling of 18918256 in words is "eighteen million, nine hundred eighteen thousand, two hundred fifty-six".