18997232 has 20 divisors (see below), whose sum is σ = 36909840. Its totient is φ = 9472128.

The previous prime is 18997229. The next prime is 18997249. The reversal of 18997232 is 23279981.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18997232.

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, 5093 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (1845492).

Almost surely, 2^18997232 is an apocalyptic number.

It is an amenable number.

18997232 is a deficient number, since it is larger than the sum of its proper divisors (17912608).

18997232 is a wasteful number, since it uses less digits than its factorization.

18997232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320 (or 3314 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 18997232 is about 4358.5814206001. The cubic root of 18997232 is about 266.8272061100.

The spelling of 18997232 in words is "eighteen million, nine hundred ninety-seven thousand, two hundred thirty-two".