859909 has 4 divisors (see below), whose sum is σ = 887680. Its totient is φ = 832140.

The previous prime is 859891. The next prime is 859913. The reversal of 859909 is 909958.

859909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 859909 - 2¹⁷ = 728837 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 (859919) 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, 13839 + ... + 13900.

It is an arithmetic number, because the mean of its divisors is an integer number (221920).

2⁸⁵⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

859909 is a deficient number, since it is larger than the sum of its proper divisors (27771).

859909 is a wasteful number, since it uses less digits than its factorization.

859909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27770.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 859909 is about 927.3127843398. The cubic root of 859909 is about 95.0934998209.

The spelling of 859909 in words is "eight hundred fifty-nine thousand, nine hundred nine".