18504372 has 12 divisors (see below), whose sum is σ = 43176896. Its totient is φ = 6168120.

The previous prime is 18504371. The next prime is 18504373. The reversal of 18504372 is 27340581.

It is an interprime number because it is at equal distance from previous prime (18504371) and next prime (18504373).

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

It is a super-2 number, since 2×18504372² = 684823566228768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18504371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771004 + ... + 771027.

Almost surely, 2^18504372 is an apocalyptic number.

18504372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18504372 is an abundant number, since it is smaller than the sum of its proper divisors (24672524).

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

18504372 is a wasteful number, since it uses less digits than its factorization.

18504372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542038 (or 1542036 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18504372 is about 4301.6708381744. The cubic root of 18504372 is about 264.4994562377.

The spelling of 18504372 in words is "eighteen million, five hundred four thousand, three hundred seventy-two".