856388812 has 18 divisors (see below), whose sum is σ = 1536137204. Its totient is φ = 417747360.

The previous prime is 856388773. The next prime is 856388837. The reversal of 856388812 is 218883658.

It is a happy number.

856388812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56958 + ... + 70405.

Almost surely, 2^856388812 is an apocalyptic number.

856388812 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

856388812 is a deficient number, since it is larger than the sum of its proper divisors (679748392).

856388812 is a wasteful number, since it uses less digits than its factorization.

856388812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127449 (or 127406 counting only the distinct ones).

The product of its digits is 737280, while the sum is 49.

The square root of 856388812 is about 29264.1215825796. The cubic root of 856388812 is about 949.6356172263.

The spelling of 856388812 in words is "eight hundred fifty-six million, three hundred eighty-eight thousand, eight hundred twelve".