18431968 has 24 divisors (see below), whose sum is σ = 36833832. Its totient is φ = 9077376.

The previous prime is 18431951. The next prime is 18431971. The reversal of 18431968 is 86913481.

It is a self number, because there is not a number n which added to its sum of digits gives 18431968.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (1534743).

Almost surely, 2^18431968 is an apocalyptic number.

It is an amenable number.

18431968 is a deficient number, since it is larger than the sum of its proper divisors (18401864).

18431968 is an equidigital number, since it uses as much as digits as its factorization.

18431968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8674 (or 8666 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 18431968 is about 4293.2467900180. The cubic root of 18431968 is about 264.1540270445.

The spelling of 18431968 in words is "eighteen million, four hundred thirty-one thousand, nine hundred sixty-eight".