856858823 has 4 divisors (see below), whose sum is σ = 857083488. Its totient is φ = 856634160.

The previous prime is 856858799. The next prime is 856858831. The reversal of 856858823 is 328858658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 856858823 - 2⁶ = 856858759 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 (856858843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106511 + ... + 114272.

It is an arithmetic number, because the mean of its divisors is an integer number (214270872).

Almost surely, 2^856858823 is an apocalyptic number.

856858823 is a deficient number, since it is larger than the sum of its proper divisors (224665).

856858823 is a wasteful number, since it uses less digits than its factorization.

856858823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224664.

The product of its digits is 3686400, while the sum is 53.

The square root of 856858823 is about 29272.1509800698. The cubic root of 856858823 is about 949.8093146365.

The spelling of 856858823 in words is "eight hundred fifty-six million, eight hundred fifty-eight thousand, eight hundred twenty-three".