18729904 has 20 divisors (see below), whose sum is σ = 36906120. Its totient is φ = 9205760.

The previous prime is 18729899. The next prime is 18729913. The reversal of 18729904 is 40992781.

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, 8977 + ... + 10864.

It is an arithmetic number, because the mean of its divisors is an integer number (1845306).

Almost surely, 2^18729904 is an apocalyptic number.

It is an amenable number.

18729904 is a deficient number, since it is larger than the sum of its proper divisors (18176216).

18729904 is a wasteful number, since it uses less digits than its factorization.

18729904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19908 (or 19902 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 18729904 is about 4327.8059106203. The cubic root of 18729904 is about 265.5696964265.

The spelling of 18729904 in words is "eighteen million, seven hundred twenty-nine thousand, nine hundred four".