809039 has 24 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 589680.

The previous prime is 809023. The next prime is 809041. The reversal of 809039 is 930908.

809039 = 127² + 128² + ... + 164².

809039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 809039 - 2⁴ = 809023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10202 + ... + 10280.

It is an arithmetic number, because the mean of its divisors is an integer number (45600).

2⁸⁰⁹⁰³⁹ is an apocalyptic number.

809039 is a deficient number, since it is larger than the sum of its proper divisors (285361).

809039 is a wasteful number, since it uses less digits than its factorization.

809039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 809039 is about 899.4659526630. The cubic root of 809039 is about 93.1800957697.

It can be divided in two parts, 80 and 9039, that added together give a palindrome (9119).

The spelling of 809039 in words is "eight hundred nine thousand, thirty-nine".