79446139 has 2 divisors, whose sum is σ = 79446140. Its totient is φ = 79446138.

The previous prime is 79446137. The next prime is 79446179. The reversal of 79446139 is 93164497.

It is a weak prime.

It is an emirp because it is prime and its reverse (93164497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79446139 - 2¹ = 79446137 is a prime.

Together with 79446137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 79446095 and 79446104.

It is not a weakly prime, because it can be changed into another prime (79446131) 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, 39723069 + 39723070.

It is an arithmetic number, because the mean of its divisors is an integer number (39723070).

Almost surely, 2^79446139 is an apocalyptic number.

79446139 is a deficient number, since it is larger than the sum of its proper divisors (1).

79446139 is an equidigital number, since it uses as much as digits as its factorization.

79446139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 79446139 is about 8913.2563634174. The cubic root of 79446139 is about 429.8902532254.

The spelling of 79446139 in words is "seventy-nine million, four hundred forty-six thousand, one hundred thirty-nine".