18372972 has 12 divisors (see below), whose sum is σ = 42870296. Its totient is φ = 6124320.

The previous prime is 18372967. The next prime is 18372973. The reversal of 18372972 is 27927381.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18372972² = 675132200225568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18372972.

It is not an unprimeable number, because it can be changed into a prime (18372973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765529 + ... + 765552.

Almost surely, 2^18372972 is an apocalyptic number.

18372972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18372972 is an abundant number, since it is smaller than the sum of its proper divisors (24497324).

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

18372972 is a wasteful number, since it uses less digits than its factorization.

18372972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531088 (or 1531086 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 18372972 is about 4286.3704926196. The cubic root of 18372972 is about 263.8718960672.

The spelling of 18372972 in words is "eighteen million, three hundred seventy-two thousand, nine hundred seventy-two".