809899 has 6 divisors (see below), whose sum is σ = 847196. Its totient is φ = 774180.

The previous prime is 809891. The next prime is 809903. The reversal of 809899 is 998908.

It is not a de Polignac number, because 809899 - 2³ = 809891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 237 + ... + 1294.

2⁸⁰⁹⁸⁹⁹ is an apocalyptic number.

809899 is a deficient number, since it is larger than the sum of its proper divisors (37297).

809899 is a wasteful number, since it uses less digits than its factorization.

809899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 809899 is about 899.9438871396. The cubic root of 809899 is about 93.2131005672.

The spelling of 809899 in words is "eight hundred nine thousand, eight hundred ninety-nine".