856206909 has 16 divisors (see below), whose sum is σ = 1268937600. Its totient is φ = 570587328.

The previous prime is 856206877. The next prime is 856206913. The reversal of 856206909 is 909602658.

856206909 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 856206909 - 2⁵ = 856206877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856206959) 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, 100197 + ... + 108405.

It is an arithmetic number, because the mean of its divisors is an integer number (79308600).

Almost surely, 2^856206909 is an apocalyptic number.

It is an amenable number.

856206909 is a deficient number, since it is larger than the sum of its proper divisors (412730691).

856206909 is a wasteful number, since it uses less digits than its factorization.

856206909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12081 (or 12075 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 856206909 is about 29261.0134650186. The cubic root of 856206909 is about 949.5683760397.

It can be divided in two parts, 85620 and 6909, that added together give a palindrome (92529).

The spelling of 856206909 in words is "eight hundred fifty-six million, two hundred six thousand, nine hundred nine".