809499872 has 12 divisors (see below), whose sum is σ = 1593702936. Its totient is φ = 404749920.

The previous prime is 809499871. The next prime is 809499907. The reversal of 809499872 is 278994908.

It is a happy number.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12648404 + ... + 12648467.

It is an arithmetic number, because the mean of its divisors is an integer number (132808578).

Almost surely, 2^809499872 is an apocalyptic number.

It is an amenable number.

809499872 is a deficient number, since it is larger than the sum of its proper divisors (784203064).

809499872 is a wasteful number, since it uses less digits than its factorization.

809499872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25296881 (or 25296873 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 809499872 is about 28451.7112314883. The cubic root of 809499872 is about 931.9778587088.

The spelling of 809499872 in words is "eight hundred nine million, four hundred ninety-nine thousand, eight hundred seventy-two".