856862874 has 80 divisors (see below), whose sum is σ = 2309841600. Its totient is φ = 231926976.

The previous prime is 856862837. The next prime is 856862879. The reversal of 856862874 is 478268658.

856862874 is a `hidden beast` number, since 8 + 5 + 6 + 8 + 628 + 7 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 856862874.

It is not an unprimeable number, because it can be changed into a prime (856862879) 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 39 ways as a sum of consecutive naturals, for example, 1662 + ... + 41430.

It is an arithmetic number, because the mean of its divisors is an integer number (28873020).

Almost surely, 2^856862874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856862874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1154920800).

856862874 is an abundant number, since it is smaller than the sum of its proper divisors (1452978726).

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

856862874 is a wasteful number, since it uses less digits than its factorization.

856862874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39809 (or 39800 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The square root of 856862874 is about 29272.2201754496. The cubic root of 856862874 is about 949.8108114492.

The spelling of 856862874 in words is "eight hundred fifty-six million, eight hundred sixty-two thousand, eight hundred seventy-four".