79822139 has 2 divisors, whose sum is σ = 79822140. Its totient is φ = 79822138.

The previous prime is 79822129. The next prime is 79822163. The reversal of 79822139 is 93122897.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79822139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79822096 and 79822105.

It is not a weakly prime, because it can be changed into another prime (79822109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39911069 + 39911070.

It is an arithmetic number, because the mean of its divisors is an integer number (39911070).

Almost surely, 2^79822139 is an apocalyptic number.

79822139 is a deficient number, since it is larger than the sum of its proper divisors (1).

79822139 is an equidigital number, since it uses as much as digits as its factorization.

79822139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 79822139 is about 8934.3236453578. The cubic root of 79822139 is about 430.5673761423.

The spelling of 79822139 in words is "seventy-nine million, eight hundred twenty-two thousand, one hundred thirty-nine".