18663904 has 36 divisors (see below), whose sum is σ = 42747264. Its totient is φ = 7998144.

The previous prime is 18663899. The next prime is 18663913. The reversal of 18663904 is 40936681.

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 5 ways as a sum of consecutive naturals, for example, 4384 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (1187424).

Almost surely, 2^18663904 is an apocalyptic number.

18663904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18663904 is an abundant number, since it is smaller than the sum of its proper divisors (24083360).

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

18663904 is a wasteful number, since it uses less digits than its factorization.

18663904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11927 (or 11912 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 18663904 is about 4320.1740705671. The cubic root of 18663904 is about 265.2573932037.

The spelling of 18663904 in words is "eighteen million, six hundred sixty-three thousand, nine hundred four".