79809 has 8 divisors (see below), whose sum is σ = 109440. Its totient is φ = 51696.

The previous prime is 79801. The next prime is 79811. The reversal of 79809 is 90897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79809 - 2³ = 79801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79809.

It is not an unprimeable number, because it can be changed into a prime (79801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249 + ... + 470.

It is an arithmetic number, because the mean of its divisors is an integer number (13680).

2⁷⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

79809 is a deficient number, since it is larger than the sum of its proper divisors (29631).

79809 is a wasteful number, since it uses less digits than its factorization.

79809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 79809 is about 282.5048672147. The cubic root of 79809 is about 43.0543750553.

It can be divided in two parts, 79 and 809, that added together give a palindrome (888).

The spelling of 79809 in words is "seventy-nine thousand, eight hundred nine".