800809 has 4 divisors (see below), whose sum is σ = 812160. Its totient is φ = 789460.

The previous prime is 800801. The next prime is 800861. The reversal of 800809 is 908008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 800809 - 2³ = 800801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5569 + ... + 5710.

It is an arithmetic number, because the mean of its divisors is an integer number (203040).

2⁸⁰⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

800809 is a deficient number, since it is larger than the sum of its proper divisors (11351).

800809 is a wasteful number, since it uses less digits than its factorization.

800809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11350.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 800809 is about 894.8793214730. The cubic root of 800809 is about 92.8630581749.

It can be divided in two parts, 80080 and 9, that added together give a square (80089 = 283²).

The spelling of 800809 in words is "eight hundred thousand, eight hundred nine".