18396979 has 2 divisors, whose sum is σ = 18396980. Its totient is φ = 18396978.

The previous prime is 18396947. The next prime is 18397003. The reversal of 18396979 is 97969381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18396979 - 2⁵ = 18396947 is a prime.

It is not a weakly prime, because it can be changed into another prime (18396479) 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 as a sum of consecutive naturals, namely, 9198489 + 9198490.

It is an arithmetic number, because the mean of its divisors is an integer number (9198490).

Almost surely, 2^18396979 is an apocalyptic number.

18396979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18396979 is an equidigital number, since it uses as much as digits as its factorization.

18396979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 18396979 is about 4289.1699663222. The cubic root of 18396979 is about 263.9867752405.

The spelling of 18396979 in words is "eighteen million, three hundred ninety-six thousand, nine hundred seventy-nine".