812806 has 4 divisors (see below), whose sum is σ = 1219212. Its totient is φ = 406402.

The previous prime is 812761. The next prime is 812807. The reversal of 812806 is 608218.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203200 + ... + 203203.

It is an arithmetic number, because the mean of its divisors is an integer number (304803).

2⁸¹²⁸⁰⁶ is an apocalyptic number.

812806 is a deficient number, since it is larger than the sum of its proper divisors (406406).

812806 is a wasteful number, since it uses less digits than its factorization.

812806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406405.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 812806 is about 901.5575411475. The cubic root of 812806 is about 93.3244917928.

The spelling of 812806 in words is "eight hundred twelve thousand, eight hundred six".