18002972 has 24 divisors (see below), whose sum is σ = 34047552. Its totient is φ = 8280000.

The previous prime is 18002969. The next prime is 18002989. The reversal of 18002972 is 27920081.

It is a happy number.

It is a congruent number.

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, 23597 + ... + 24347.

It is an arithmetic number, because the mean of its divisors is an integer number (1418648).

Almost surely, 2^18002972 is an apocalyptic number.

It is an amenable number.

18002972 is a deficient number, since it is larger than the sum of its proper divisors (16044580).

18002972 is a wasteful number, since it uses less digits than its factorization.

18002972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18002972 is about 4242.9909262217. The cubic root of 18002972 is about 262.0885624112.

The spelling of 18002972 in words is "eighteen million, two thousand, nine hundred seventy-two".