18538472 has 16 divisors (see below), whose sum is σ = 34810560. Its totient is φ = 9255664.

The previous prime is 18538469. The next prime is 18538489. The reversal of 18538472 is 27483581.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6353 + ... + 8799.

It is an arithmetic number, because the mean of its divisors is an integer number (2175660).

Almost surely, 2^18538472 is an apocalyptic number.

It is an amenable number.

18538472 is a deficient number, since it is larger than the sum of its proper divisors (16272088).

18538472 is a wasteful number, since it uses less digits than its factorization.

18538472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400 (or 3396 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 18538472 is about 4305.6325899919. The cubic root of 18538472 is about 264.6618304191.

The spelling of 18538472 in words is "eighteen million, five hundred thirty-eight thousand, four hundred seventy-two".