18158964 has 24 divisors (see below), whose sum is σ = 42762720. Its totient is φ = 5997024.

The previous prime is 18158953. The next prime is 18158977. The reversal of 18158964 is 46985181.

It is a congruent number.

It is an unprimeable number.

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, 5634 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (1781780).

Almost surely, 2^18158964 is an apocalyptic number.

It is an amenable number.

18158964 is an abundant number, since it is smaller than the sum of its proper divisors (24603756).

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

18158964 is a wasteful number, since it uses less digits than its factorization.

18158964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13999 (or 13997 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 18158964 is about 4261.3335940759. Note that the first 3 decimals coincide. The cubic root of 18158964 is about 262.8433674368.

The spelling of 18158964 in words is "eighteen million, one hundred fifty-eight thousand, nine hundred sixty-four".