79836139 has 2 divisors, whose sum is σ = 79836140. Its totient is φ = 79836138.

The previous prime is 79836103. The next prime is 79836149. The reversal of 79836139 is 93163897.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79836139 is a prime.

It is not a weakly prime, because it can be changed into another prime (79836149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39918069 + 39918070.

It is an arithmetic number, because the mean of its divisors is an integer number (39918070).

Almost surely, 2^79836139 is an apocalyptic number.

79836139 is a deficient number, since it is larger than the sum of its proper divisors (1).

79836139 is an equidigital number, since it uses as much as digits as its factorization.

79836139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 79836139 is about 8935.1071062411. The cubic root of 79836139 is about 430.5925470659.

The spelling of 79836139 in words is "seventy-nine million, eight hundred thirty-six thousand, one hundred thirty-nine".