856787194384 has 135 divisors (see below), whose sum is σ = 1851140470599. Its totient is φ = 383876444160.

The previous prime is 856787194369. The next prime is 856787194463. The reversal of 856787194384 is 483491787658.

The square root of 856787194384 is 925628.

It is a perfect power (a square), and thus also a powerful number.

856787194384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3986659600 + 852800534784 = 63140^2 + 923472^2 .

It is a super-2 number, since 2×856787194384² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (325140480) is a multiple of the sum of its prime divisors (315).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4439311792 + ... + 4439311984.

Almost surely, 2^856787194384 is an apocalyptic number.

856787194384 is the 925628-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856787194384

856787194384 is an abundant number, since it is smaller than the sum of its proper divisors (994353276215).

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

856787194384 is a wasteful number, since it uses less digits than its factorization.

856787194384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 315 counting only the distinct ones).

The product of its digits is 325140480, while the sum is 70.

The spelling of 856787194384 in words is "eight hundred fifty-six billion, seven hundred eighty-seven million, one hundred ninety-four thousand, three hundred eighty-four".