812856 has 32 divisors (see below), whose sum is σ = 2217600. Its totient is φ = 246240.

The previous prime is 812849. The next prime is 812857. The reversal of 812856 is 658218.

812856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812857) 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, 1276 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2⁸¹²⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

812856 is an abundant number, since it is smaller than the sum of its proper divisors (1404744).

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

812856 is a wasteful number, since it uses less digits than its factorization.

812856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099 (or 3095 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 812856 is about 901.5852705097. The cubic root of 812856 is about 93.3264053815.

The spelling of 812856 in words is "eight hundred twelve thousand, eight hundred fifty-six".