859809 has 16 divisors (see below), whose sum is σ = 1268352. Its totient is φ = 515328.

The previous prime is 859801. The next prime is 859823. The reversal of 859809 is 908958.

859809 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 859809 - 2³ = 859801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (79272).

2⁸⁵⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

859809 is a deficient number, since it is larger than the sum of its proper divisors (408543).

859809 is a wasteful number, since it uses less digits than its factorization.

859809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 859809 is about 927.2588635327. The cubic root of 859809 is about 95.0898134934.

The spelling of 859809 in words is "eight hundred fifty-nine thousand, eight hundred nine".