79997439 has 4 divisors (see below), whose sum is σ = 106663256. Its totient is φ = 53331624.

The previous prime is 79997387. The next prime is 79997447. The reversal of 79997439 is 93479997.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79997439 - 2⁹ = 79996927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79997339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13332904 + ... + 13332909.

It is an arithmetic number, because the mean of its divisors is an integer number (26665814).

Almost surely, 2^79997439 is an apocalyptic number.

79997439 is a deficient number, since it is larger than the sum of its proper divisors (26665817).

79997439 is a wasteful number, since it uses less digits than its factorization.

79997439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26665816.

The product of its digits is 3857868, while the sum is 57.

The square root of 79997439 is about 8944.1287446011. The cubic root of 79997439 is about 430.8823400346.

The spelling of 79997439 in words is "seventy-nine million, nine hundred ninety-seven thousand, four hundred thirty-nine".