18408979 has 2 divisors, whose sum is σ = 18408980. Its totient is φ = 18408978.

The previous prime is 18408953. The next prime is 18408983. The reversal of 18408979 is 97980481.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97980481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18408979 - 2¹¹ = 18406931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18408989) 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 as a sum of consecutive naturals, namely, 9204489 + 9204490.

It is an arithmetic number, because the mean of its divisors is an integer number (9204490).

Almost surely, 2^18408979 is an apocalyptic number.

18408979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18408979 is an equidigital number, since it uses as much as digits as its factorization.

18408979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18408979 is about 4290.5686103359. The cubic root of 18408979 is about 264.0441606184.

The spelling of 18408979 in words is "eighteen million, four hundred eight thousand, nine hundred seventy-nine".