809199479 has 18 divisors (see below), whose sum is σ = 919200240. Its totient is φ = 711803400.

The previous prime is 809199467. The next prime is 809199497. The reversal of 809199479 is 974991908.

It is not a de Polignac number, because 809199479 - 2¹² = 809195383 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 (809195479) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 112802 + ... + 119760.

It is an arithmetic number, because the mean of its divisors is an integer number (51066680).

Almost surely, 2^809199479 is an apocalyptic number.

809199479 is a deficient number, since it is larger than the sum of its proper divisors (110000761).

809199479 is a wasteful number, since it uses less digits than its factorization.

809199479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043 (or 7001 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 809199479 is about 28446.4317445967. The cubic root of 809199479 is about 931.8625635448.

The spelling of 809199479 in words is "eight hundred nine million, one hundred ninety-nine thousand, four hundred seventy-nine".