79039809 has 12 divisors (see below), whose sum is σ = 114255700. Its totient is φ = 52653024.

The previous prime is 79039789. The next prime is 79039823. The reversal of 79039809 is 90893097.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77000625 + 2039184 = 8775^2 + 1428^2 .

It is not a de Polignac number, because 79039809 - 2¹⁷ = 78908737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79039879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13647 + ... + 18555.

Almost surely, 2^79039809 is an apocalyptic number.

It is an amenable number.

79039809 is a deficient number, since it is larger than the sum of its proper divisors (35215891).

79039809 is a wasteful number, since it uses less digits than its factorization.

79039809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704 (or 6701 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 79039809 is about 8890.4335664803. The cubic root of 79039809 is about 429.1561040456.

The spelling of 79039809 in words is "seventy-nine million, thirty-nine thousand, eight hundred nine".