79440979 has 2 divisors, whose sum is σ = 79440980. Its totient is φ = 79440978.

The previous prime is 79440967. The next prime is 79441027. The reversal of 79440979 is 97904497.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79440979 - 2⁹ = 79440467 is a prime.

It is not a weakly prime, because it can be changed into another prime (79440929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39720489 + 39720490.

It is an arithmetic number, because the mean of its divisors is an integer number (39720490).

Almost surely, 2^79440979 is an apocalyptic number.

79440979 is a deficient number, since it is larger than the sum of its proper divisors (1).

79440979 is an equidigital number, since it uses as much as digits as its factorization.

79440979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 79440979 is about 8912.9669022161. The cubic root of 79440979 is about 429.8809459481.

The spelling of 79440979 in words is "seventy-nine million, four hundred forty thousand, nine hundred seventy-nine".