856021144 has 32 divisors (see below), whose sum is σ = 1752791040. Its totient is φ = 388692000.

The previous prime is 856021123. The next prime is 856021163. The reversal of 856021144 is 441120658.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 88969 + ... + 98119.

It is an arithmetic number, because the mean of its divisors is an integer number (54774720).

Almost surely, 2^856021144 is an apocalyptic number.

It is an amenable number.

856021144 is an abundant number, since it is smaller than the sum of its proper divisors (896769896).

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

856021144 is a wasteful number, since it uses less digits than its factorization.

856021144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10231 (or 10227 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 856021144 is about 29257.8390179453. The cubic root of 856021144 is about 949.4996974192.

The spelling of 856021144 in words is "eight hundred fifty-six million, twenty-one thousand, one hundred forty-four".