79397609 has 4 divisors (see below), whose sum is σ = 79443780. Its totient is φ = 79351440.

The previous prime is 79397581. The next prime is 79397627. The reversal of 79397609 is 90679397.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56625625 + 22771984 = 7525^2 + 4772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79397609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79397629) 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, 20402 + ... + 23979.

It is an arithmetic number, because the mean of its divisors is an integer number (19860945).

Almost surely, 2^79397609 is an apocalyptic number.

It is an amenable number.

79397609 is a deficient number, since it is larger than the sum of its proper divisors (46171).

79397609 is a wasteful number, since it uses less digits than its factorization.

79397609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46170.

The product of its (nonzero) digits is 642978, while the sum is 50.

The square root of 79397609 is about 8910.5335979390. The cubic root of 79397609 is about 429.8027019875.

The spelling of 79397609 in words is "seventy-nine million, three hundred ninety-seven thousand, six hundred nine".