856643382 has 36 divisors (see below), whose sum is σ = 2159093196. Its totient is φ = 244755000.

The previous prime is 856643371. The next prime is 856643387. The reversal of 856643382 is 283346658.

It is a happy number.

856643382 is a `hidden beast` number, since 8 + 566 + 4 + 3 + 3 + 82 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856643387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 484744 + ... + 486507.

It is an arithmetic number, because the mean of its divisors is an integer number (59974811).

Almost surely, 2^856643382 is an apocalyptic number.

856643382 is an abundant number, since it is smaller than the sum of its proper divisors (1302449814).

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

856643382 is a wasteful number, since it uses less digits than its factorization.

856643382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971273 (or 971263 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 856643382 is about 29268.4707834215. The cubic root of 856643382 is about 949.7297040809.

The spelling of 856643382 in words is "eight hundred fifty-six million, six hundred forty-three thousand, three hundred eighty-two".