18745979 has 32 divisors (see below), whose sum is σ = 23654400. Its totient is φ = 14817600.

The previous prime is 18745967. The next prime is 18746003. The reversal of 18745979 is 97954781.

It is not a de Polignac number, because 18745979 - 2⁴ = 18745963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18745949) 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, 435932 + ... + 435974.

It is an arithmetic number, because the mean of its divisors is an integer number (739200).

Almost surely, 2^18745979 is an apocalyptic number.

18745979 is a deficient number, since it is larger than the sum of its proper divisors (4908421).

18745979 is an equidigital number, since it uses as much as digits as its factorization.

18745979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 122 counting only the distinct ones).

The product of its digits is 635040, while the sum is 50.

The square root of 18745979 is about 4329.6626889401. The cubic root of 18745979 is about 265.6456500486.

The spelling of 18745979 in words is "eighteen million, seven hundred forty-five thousand, nine hundred seventy-nine".