18113956 has 12 divisors (see below), whose sum is σ = 36227968. Its totient is φ = 7763112.

The previous prime is 18113939. The next prime is 18113957. The reversal of 18113956 is 65931181.

18113956 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18113957) 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, 323436 + ... + 323491.

Almost surely, 2^18113956 is an apocalyptic number.

It is an amenable number.

18113956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18113956 is a wasteful number, since it uses less digits than its factorization.

18113956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646938 (or 646936 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 18113956 is about 4256.0493418192. The cubic root of 18113956 is about 262.6260304863.

Subtracting 18113956 from its reverse (65931181), we obtain a square (47817225 = 6915²).

The spelling of 18113956 in words is "eighteen million, one hundred thirteen thousand, nine hundred fifty-six".