18686972 has 12 divisors (see below), whose sum is σ = 32903976. Its totient is φ = 9285840.

The previous prime is 18686959. The next prime is 18686977. The reversal of 18686972 is 27968681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686977) 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, 13679 + ... + 14982.

It is an arithmetic number, because the mean of its divisors is an integer number (2741998).

Almost surely, 2^18686972 is an apocalyptic number.

It is an amenable number.

18686972 is a deficient number, since it is larger than the sum of its proper divisors (14217004).

18686972 is a wasteful number, since it uses less digits than its factorization.

18686972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28828 (or 28826 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 18686972 is about 4322.8430459595. The cubic root of 18686972 is about 265.3666314840.

The spelling of 18686972 in words is "eighteen million, six hundred eighty-six thousand, nine hundred seventy-two".