18521164 has 24 divisors (see below), whose sum is σ = 34741728. Its totient is φ = 8616960.

The previous prime is 18521161. The next prime is 18521179. The reversal of 18521164 is 46112581.

It is not an unprimeable number, because it can be changed into a prime (18521161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (1447572).

Almost surely, 2^18521164 is an apocalyptic number.

It is an amenable number.

18521164 is a deficient number, since it is larger than the sum of its proper divisors (16220564).

18521164 is a wasteful number, since it uses less digits than its factorization.

18521164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505 (or 5503 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 18521164 is about 4303.6221953141. The cubic root of 18521164 is about 264.5794397151.

The spelling of 18521164 in words is "eighteen million, five hundred twenty-one thousand, one hundred sixty-four".