18757979 has 2 divisors, whose sum is σ = 18757980. Its totient is φ = 18757978.

The previous prime is 18757961. The next prime is 18758009. The reversal of 18757979 is 97975781.

It is a weak prime.

It is an emirp because it is prime and its reverse (97975781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18757979 - 2⁸ = 18757723 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18757979.

It is not a weakly prime, because it can be changed into another prime (18757279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9378989 + 9378990.

It is an arithmetic number, because the mean of its divisors is an integer number (9378990).

Almost surely, 2^18757979 is an apocalyptic number.

18757979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18757979 is an equidigital number, since it uses as much as digits as its factorization.

18757979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 53.

The square root of 18757979 is about 4331.0482564848. The cubic root of 18757979 is about 265.7023211858.

The spelling of 18757979 in words is "eighteen million, seven hundred fifty-seven thousand, nine hundred seventy-nine".