79639723 has 2 divisors, whose sum is σ = 79639724. Its totient is φ = 79639722.

The previous prime is 79639699. The next prime is 79639759. The reversal of 79639723 is 32793697.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79639723 - 2⁹ = 79639211 is a prime.

It is not a weakly prime, because it can be changed into another prime (79639783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39819861 + 39819862.

It is an arithmetic number, because the mean of its divisors is an integer number (39819862).

Almost surely, 2^79639723 is an apocalyptic number.

79639723 is a deficient number, since it is larger than the sum of its proper divisors (1).

79639723 is an equidigital number, since it uses as much as digits as its factorization.

79639723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 46.

The square root of 79639723 is about 8924.1090871862. The cubic root of 79639723 is about 430.2391368592.

The spelling of 79639723 in words is "seventy-nine million, six hundred thirty-nine thousand, seven hundred twenty-three".