856043685 has 48 divisors (see below), whose sum is σ = 1724561280. Its totient is φ = 384693120.

The previous prime is 856043681. The next prime is 856043707. The reversal of 856043685 is 586340658.

856043685 is a `hidden beast` number, since 8 + 5 + 604 + 36 + 8 + 5 = 666.

It is not a de Polignac number, because 856043685 - 2² = 856043681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 856043685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856043681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4446 + ... + 41615.

It is an arithmetic number, because the mean of its divisors is an integer number (35928360).

Almost surely, 2^856043685 is an apocalyptic number.

It is an amenable number.

856043685 is an abundant number, since it is smaller than the sum of its proper divisors (868517595).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856043685 is a wasteful number, since it uses less digits than its factorization.

856043685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46138 (or 46135 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 856043685 is about 29258.2242284114. The cubic root of 856043685 is about 949.5080315143.

The spelling of 856043685 in words is "eight hundred fifty-six million, forty-three thousand, six hundred eighty-five".