18578979 has 12 divisors (see below), whose sum is σ = 28249000. Its totient is φ = 11733984.

The previous prime is 18578939. The next prime is 18579019. The reversal of 18578979 is 97987581.

It is an interprime number because it is at equal distance from previous prime (18578939) and next prime (18579019).

It is not a de Polignac number, because 18578979 - 2⁷ = 18578851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18578939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54154 + ... + 54495.

Almost surely, 2^18578979 is an apocalyptic number.

18578979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18578979 is a deficient number, since it is larger than the sum of its proper divisors (9670021).

18578979 is a wasteful number, since it uses less digits than its factorization.

18578979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108674 (or 108671 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 18578979 is about 4310.3339777794. Note that the first 3 decimals coincide. The cubic root of 18578979 is about 264.8544543119.

The spelling of 18578979 in words is "eighteen million, five hundred seventy-eight thousand, nine hundred seventy-nine".