809499879 has 16 divisors (see below), whose sum is σ = 1201068000. Its totient is φ = 538852608.

The previous prime is 809499871. The next prime is 809499907. The reversal of 809499879 is 978994908.

It is not a de Polignac number, because 809499879 - 2³ = 809499871 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809499871) 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, 4104 + ... + 40445.

It is an arithmetic number, because the mean of its divisors is an integer number (75066750).

Almost surely, 2^809499879 is an apocalyptic number.

809499879 is a deficient number, since it is larger than the sum of its proper divisors (391568121).

809499879 is a wasteful number, since it uses less digits than its factorization.

809499879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45231 (or 45225 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The square root of 809499879 is about 28451.7113545038. The cubic root of 809499879 is about 931.9778613952.

The spelling of 809499879 in words is "eight hundred nine million, four hundred ninety-nine thousand, eight hundred seventy-nine".