809479209 has 16 divisors (see below), whose sum is σ = 1345628160. Its totient is φ = 420508560.

The previous prime is 809479199. The next prime is 809479213. The reversal of 809479209 is 902974908.

It is a happy number.

809479209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 809479209 - 2¹³ = 809471017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (809479709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751889 + ... + 1752350.

It is an arithmetic number, because the mean of its divisors is an integer number (84101760).

Almost surely, 2^809479209 is an apocalyptic number.

It is an amenable number.

809479209 is a deficient number, since it is larger than the sum of its proper divisors (536148951).

809479209 is a wasteful number, since it uses less digits than its factorization.

809479209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504260.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 809479209 is about 28451.3481051426. The cubic root of 809479209 is about 931.9699288651.

The spelling of 809479209 in words is "eight hundred nine million, four hundred seventy-nine thousand, two hundred nine".