279937979 has 2 divisors, whose sum is σ = 279937980. Its totient is φ = 279937978.

The previous prime is 279937943. The next prime is 279937981. The reversal of 279937979 is 979739972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 279937979 - 2¹⁶ = 279872443 is a prime.

Together with 279937981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (279937909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139968989 + 139968990.

It is an arithmetic number, because the mean of its divisors is an integer number (139968990).

Almost surely, 2^279937979 is an apocalyptic number.

279937979 is a deficient number, since it is larger than the sum of its proper divisors (1).

279937979 is an equidigital number, since it uses as much as digits as its factorization.

279937979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13502538, while the sum is 62.

The square root of 279937979 is about 16731.3471962063. The cubic root of 279937979 is about 654.1649549461.

The spelling of 279937979 in words is "two hundred seventy-nine million, nine hundred thirty-seven thousand, nine hundred seventy-nine".