18012156 has 48 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 5818176.

The previous prime is 18012149. The next prime is 18012167. The reversal of 18012156 is 65121081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80661 + ... + 80883.

It is an arithmetic number, because the mean of its divisors is an integer number (903168).

Almost surely, 2^18012156 is an apocalyptic number.

It is an amenable number.

18012156 is an abundant number, since it is smaller than the sum of its proper divisors (25339908).

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

18012156 is a wasteful number, since it uses less digits than its factorization.

18012156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 18012156 is about 4244.0730436693. The cubic root of 18012156 is about 262.1331219460.

The spelling of 18012156 in words is "eighteen million, twelve thousand, one hundred fifty-six".