79009 has 4 divisors (see below), whose sum is σ = 90304. Its totient is φ = 67716.

The previous prime is 78989. The next prime is 79031. The reversal of 79009 is 90097.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79009 - 2⁵ = 78977 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 (79039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5637 + ... + 5650.

It is an arithmetic number, because the mean of its divisors is an integer number (22576).

2⁷⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

79009 is a deficient number, since it is larger than the sum of its proper divisors (11295).

79009 is a wasteful number, since it uses less digits than its factorization.

79009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11294.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 79009 is about 281.0853962766. The cubic root of 79009 is about 42.9100336415.

The spelling of 79009 in words is "seventy-nine thousand, nine".