18367979 has 4 divisors (see below), whose sum is σ = 20991984. Its totient is φ = 15743976.

The previous prime is 18367967. The next prime is 18368029. The reversal of 18367979 is 97976381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18367979 - 2⁴ = 18367963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18367949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311992 + ... + 1312005.

It is an arithmetic number, because the mean of its divisors is an integer number (5247996).

Almost surely, 2^18367979 is an apocalyptic number.

18367979 is a deficient number, since it is larger than the sum of its proper divisors (2624005).

18367979 is an equidigital number, since it uses as much as digits as its factorization.

18367979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624004.

The product of its digits is 571536, while the sum is 50.

The square root of 18367979 is about 4285.7880255561. The cubic root of 18367979 is about 263.8479908122.

The spelling of 18367979 in words is "eighteen million, three hundred sixty-seven thousand, nine hundred seventy-nine".