811956 has 24 divisors (see below), whose sum is σ = 1923264. Its totient is φ = 266560.

The previous prime is 811933. The next prime is 811957. The reversal of 811956 is 659118.

It is a happy number.

811956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811957) by changing a digit.

811956 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (80136).

2⁸¹¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

811956 is an abundant number, since it is smaller than the sum of its proper divisors (1111308).

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

811956 is a wasteful number, since it uses less digits than its factorization.

811956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031 (or 1029 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 811956 is about 901.0860114329. The cubic root of 811956 is about 93.2919487727.

The spelling of 811956 in words is "eight hundred eleven thousand, nine hundred fifty-six".