18979087 has 2 divisors, whose sum is σ = 18979088. Its totient is φ = 18979086.

The previous prime is 18979073. The next prime is 18979111. The reversal of 18979087 is 78097981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18979087 - 2⁷ = 18978959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18979087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18979027) 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, 9489543 + 9489544.

It is an arithmetic number, because the mean of its divisors is an integer number (9489544).

Almost surely, 2^18979087 is an apocalyptic number.

18979087 is a deficient number, since it is larger than the sum of its proper divisors (1).

18979087 is an equidigital number, since it uses as much as digits as its factorization.

18979087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 18979087 is about 4356.4993974520. The cubic root of 18979087 is about 266.7422266783.

The spelling of 18979087 in words is "eighteen million, nine hundred seventy-nine thousand, eighty-seven".