18402156 has 18 divisors (see below), whose sum is σ = 46516652. Its totient is φ = 6134040.

The previous prime is 18402119. The next prime is 18402157. The reversal of 18402156 is 65120481.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (18402157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255550 + ... + 255621.

Almost surely, 2^18402156 is an apocalyptic number.

It is an amenable number.

18402156 is an abundant number, since it is smaller than the sum of its proper divisors (28114496).

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

18402156 is a wasteful number, since it uses less digits than its factorization.

18402156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511181 (or 511176 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18402156 is about 4289.7734205899. The cubic root of 18402156 is about 264.0115353086.

The spelling of 18402156 in words is "eighteen million, four hundred two thousand, one hundred fifty-six".