18648979 has 2 divisors, whose sum is σ = 18648980. Its totient is φ = 18648978.

The previous prime is 18648961. The next prime is 18648991. The reversal of 18648979 is 97984681.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18648979 - 2⁵ = 18648947 is a prime.

It is not a weakly prime, because it can be changed into another prime (18642979) 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, 9324489 + 9324490.

It is an arithmetic number, because the mean of its divisors is an integer number (9324490).

Almost surely, 2^18648979 is an apocalyptic number.

18648979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18648979 is an equidigital number, since it uses as much as digits as its factorization.

18648979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 18648979 is about 4318.4463641453. The cubic root of 18648979 is about 265.1866680515.

The spelling of 18648979 in words is "eighteen million, six hundred forty-eight thousand, nine hundred seventy-nine".