856449712 has 40 divisors (see below), whose sum is σ = 1755959040. Its totient is φ = 403824960.

The previous prime is 856449709. The next prime is 856449743. The reversal of 856449712 is 217944658.

It is a super-2 number, since 2×856449712² = 1467012218369765888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9739 + ... + 42517.

It is an arithmetic number, because the mean of its divisors is an integer number (43898976).

Almost surely, 2^856449712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856449712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877979520).

856449712 is an abundant number, since it is smaller than the sum of its proper divisors (899509328).

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

856449712 is a wasteful number, since it uses less digits than its factorization.

856449712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32881 (or 32875 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 856449712 is about 29265.1620873693. The cubic root of 856449712 is about 949.6581270324.

The spelling of 856449712 in words is "eight hundred fifty-six million, four hundred forty-nine thousand, seven hundred twelve".