18013172 has 24 divisors (see below), whose sum is σ = 32363520. Its totient is φ = 8769600.

The previous prime is 18013153. The next prime is 18013181. The reversal of 18013172 is 27131081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29672 + ... + 30272.

It is an arithmetic number, because the mean of its divisors is an integer number (1348480).

Almost surely, 2^18013172 is an apocalyptic number.

It is an amenable number.

18013172 is a deficient number, since it is larger than the sum of its proper divisors (14350348).

18013172 is a wasteful number, since it uses less digits than its factorization.

18013172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 18013172 is about 4244.1927383190. The cubic root of 18013172 is about 262.1380505110.

The spelling of 18013172 in words is "eighteen million, thirteen thousand, one hundred seventy-two".