18472720 has 40 divisors (see below), whose sum is σ = 49086144. Its totient is φ = 6333312.

The previous prime is 18472711. The next prime is 18472733. The reversal of 18472720 is 2727481.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15934 + ... + 17053.

Almost surely, 2^18472720 is an apocalyptic number.

18472720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18472720 is an abundant number, since it is smaller than the sum of its proper divisors (30613424).

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

18472720 is a wasteful number, since it uses less digits than its factorization.

18472720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33007 (or 33001 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 18472720 is about 4297.9902280019. The cubic root of 18472720 is about 264.3485601005.

The spelling of 18472720 in words is "eighteen million, four hundred seventy-two thousand, seven hundred twenty".