18704979 has 32 divisors (see below), whose sum is σ = 28956480. Its totient is φ = 11923200.

The previous prime is 18704929. The next prime is 18704989. The reversal of 18704979 is 97940781.

It is not a de Polignac number, because 18704979 - 2⁸ = 18704723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18704929) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 67389 + ... + 67665.

It is an arithmetic number, because the mean of its divisors is an integer number (904890).

Almost surely, 2^18704979 is an apocalyptic number.

18704979 is a deficient number, since it is larger than the sum of its proper divisors (10251501).

18704979 is a wasteful number, since it uses less digits than its factorization.

18704979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 18704979 is about 4324.9253172743. The cubic root of 18704979 is about 265.4518409889.

It can be divided in two parts, 18704 and 979, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18704979 in words is "eighteen million, seven hundred four thousand, nine hundred seventy-nine".