18895979 has 2 divisors, whose sum is σ = 18895980. Its totient is φ = 18895978.

The previous prime is 18895951. The next prime is 18895991. The reversal of 18895979 is 97959881.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97959881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18895979 - 2¹⁶ = 18830443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18895379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447989 + 9447990.

It is an arithmetic number, because the mean of its divisors is an integer number (9447990).

Almost surely, 2^18895979 is an apocalyptic number.

18895979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18895979 is an equidigital number, since it uses as much as digits as its factorization.

18895979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The square root of 18895979 is about 4346.9505403213. The cubic root of 18895979 is about 266.3523089079.

The spelling of 18895979 in words is "eighteen million, eight hundred ninety-five thousand, nine hundred seventy-nine".