18930872 has 16 divisors (see below), whose sum is σ = 35996400. Its totient is φ = 9331840.

The previous prime is 18930853. The next prime is 18930887. The reversal of 18930872 is 27803981.

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 3 ways as a sum of consecutive naturals, for example, 16097 + ... + 17232.

It is an arithmetic number, because the mean of its divisors is an integer number (2249775).

Almost surely, 2^18930872 is an apocalyptic number.

It is an amenable number.

18930872 is a deficient number, since it is larger than the sum of its proper divisors (17065528).

18930872 is a wasteful number, since it uses less digits than its factorization.

18930872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33406 (or 33402 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18930872 is about 4350.9621924351. The cubic root of 18930872 is about 266.5161553425.

The spelling of 18930872 in words is "eighteen million, nine hundred thirty thousand, eight hundred seventy-two".