79439839 has 2 divisors, whose sum is σ = 79439840. Its totient is φ = 79439838.

The previous prime is 79439821. The next prime is 79439849. The reversal of 79439839 is 93893497.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79439839 - 2⁵ = 79439807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79439809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39719919 + 39719920.

It is an arithmetic number, because the mean of its divisors is an integer number (39719920).

Almost surely, 2^79439839 is an apocalyptic number.

79439839 is a deficient number, since it is larger than the sum of its proper divisors (1).

79439839 is an equidigital number, since it uses as much as digits as its factorization.

79439839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 52.

The square root of 79439839 is about 8912.9029502177. The cubic root of 79439839 is about 429.8788896348.

The spelling of 79439839 in words is "seventy-nine million, four hundred thirty-nine thousand, eight hundred thirty-nine".