18968979 has 8 divisors (see below), whose sum is σ = 25320592. Its totient is φ = 12631680.

The previous prime is 18968969. The next prime is 18969001. The reversal of 18968979 is 97986981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18968979 - 2⁵ = 18968947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18968909) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 39 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (3165074).

Almost surely, 2^18968979 is an apocalyptic number.

18968979 is a deficient number, since it is larger than the sum of its proper divisors (6351613).

18968979 is a wasteful number, since it uses less digits than its factorization.

18968979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157.

The product of its digits is 1959552, while the sum is 57.

The square root of 18968979 is about 4355.3391371970. The cubic root of 18968979 is about 266.6948638586.

The spelling of 18968979 in words is "eighteen million, nine hundred sixty-eight thousand, nine hundred seventy-nine".