79923769 has 2 divisors, whose sum is σ = 79923770. Its totient is φ = 79923768.

The previous prime is 79923763. The next prime is 79923787. The reversal of 79923769 is 96732997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79923600 + 169 = 8940^2 + 13^2 .

It is an emirp because it is prime and its reverse (96732997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79923769 - 2²³ = 71535161 is a prime.

It is a super-2 number, since 2×79923769² = 12775617702330722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79923763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39961884 + 39961885.

It is an arithmetic number, because the mean of its divisors is an integer number (39961885).

Almost surely, 2^79923769 is an apocalyptic number.

It is an amenable number.

79923769 is a deficient number, since it is larger than the sum of its proper divisors (1).

79923769 is an equidigital number, since it uses as much as digits as its factorization.

79923769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1285956, while the sum is 52.

The square root of 79923769 is about 8940.0094518966. The cubic root of 79923769 is about 430.7500322529.

The spelling of 79923769 in words is "seventy-nine million, nine hundred twenty-three thousand, seven hundred sixty-nine".