18033156 has 18 divisors (see below), whose sum is σ = 45583902. Its totient is φ = 6011040.

The previous prime is 18033133. The next prime is 18033163. The reversal of 18033156 is 65133081.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 2160900 = 3984^2 + 1470^2 .

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

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 250425 + ... + 250496.

It is an arithmetic number, because the mean of its divisors is an integer number (2532439).

Almost surely, 2^18033156 is an apocalyptic number.

It is an amenable number.

18033156 is an abundant number, since it is smaller than the sum of its proper divisors (27550746).

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

18033156 is a wasteful number, since it uses less digits than its factorization.

18033156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500931 (or 500926 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 18033156 is about 4246.5463614566. The cubic root of 18033156 is about 262.2349542426.

The spelling of 18033156 in words is "eighteen million, thirty-three thousand, one hundred fifty-six".