18193972 has 12 divisors (see below), whose sum is σ = 31874976. Its totient is φ = 9086840.

The previous prime is 18193969. The next prime is 18194021. The reversal of 18193972 is 27939181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2697 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (2656248).

Almost surely, 2^18193972 is an apocalyptic number.

It is an amenable number.

18193972 is a deficient number, since it is larger than the sum of its proper divisors (13681004).

18193972 is a wasteful number, since it uses less digits than its factorization.

18193972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078 (or 5076 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 18193972 is about 4265.4392505345. The cubic root of 18193972 is about 263.0121677013.

The spelling of 18193972 in words is "eighteen million, one hundred ninety-three thousand, nine hundred seventy-two".