18504872 has 16 divisors (see below), whose sum is σ = 35186400. Its totient is φ = 9121840.

The previous prime is 18504869. The next prime is 18504883. The reversal of 18504872 is 27840581.

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 3 ways as a sum of consecutive naturals, for example, 15722 + ... + 16857.

It is an arithmetic number, because the mean of its divisors is an integer number (2199150).

Almost surely, 2^18504872 is an apocalyptic number.

It is an amenable number.

18504872 is a deficient number, since it is larger than the sum of its proper divisors (16681528).

18504872 is a wasteful number, since it uses less digits than its factorization.

18504872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32656 (or 32652 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 18504872 is about 4301.7289547344. The cubic root of 18504872 is about 264.5018385313.

The spelling of 18504872 in words is "eighteen million, five hundred four thousand, eight hundred seventy-two".