856261992 has 32 divisors (see below), whose sum is σ = 2198512800. Its totient is φ = 277706304.

The previous prime is 856261957. The next prime is 856261997. The reversal of 856261992 is 299162658.

It is not an unprimeable number, because it can be changed into a prime (856261997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481242 + ... + 483017.

It is an arithmetic number, because the mean of its divisors is an integer number (68703525).

Almost surely, 2^856261992 is an apocalyptic number.

It is an amenable number.

856261992 is an abundant number, since it is smaller than the sum of its proper divisors (1342250808).

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

856261992 is a wasteful number, since it uses less digits than its factorization.

856261992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964305 (or 964301 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 856261992 is about 29261.9546852222. The cubic root of 856261992 is about 949.5887387008.

The spelling of 856261992 in words is "eight hundred fifty-six million, two hundred sixty-one thousand, nine hundred ninety-two".