810812 has 12 divisors (see below), whose sum is σ = 1442616. Its totient is φ = 398640.

The previous prime is 810809. The next prime is 810839. The reversal of 810812 is 218018.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1418 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (120218).

2⁸¹⁰⁸¹² is an apocalyptic number.

It is an amenable number.

810812 is a deficient number, since it is larger than the sum of its proper divisors (631804).

810812 is a wasteful number, since it uses less digits than its factorization.

810812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388 (or 3386 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 810812 is about 900.4509981115. The cubic root of 810812 is about 93.2481138226.

The spelling of 810812 in words is "eight hundred ten thousand, eight hundred twelve".