18328972 has 12 divisors (see below), whose sum is σ = 32132800. Its totient is φ = 9148176.

The previous prime is 18328969. The next prime is 18328979. The reversal of 18328972 is 27982381.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18328979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347 + ... + 6202.

Almost surely, 2^18328972 is an apocalyptic number.

It is an amenable number.

18328972 is a deficient number, since it is larger than the sum of its proper divisors (13803828).

18328972 is a wasteful number, since it uses less digits than its factorization.

18328972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8160 (or 8158 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 18328972 is about 4281.2348685864. The cubic root of 18328972 is about 263.6610856073.

The spelling of 18328972 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred seventy-two".