809812 has 12 divisors (see below), whose sum is σ = 1500660. Its totient is φ = 381056.

The previous prime is 809803. The next prime is 809821. The reversal of 809812 is 218908.

809812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (809803) and next prime (809821).

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 352836 = 676^2 + 594^2 .

It is a congruent number.

It is an unprimeable number.

809812 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 3 ways as a sum of consecutive naturals, for example, 5887 + ... + 6022.

It is an arithmetic number, because the mean of its divisors is an integer number (125055).

2⁸⁰⁹⁸¹² is an apocalyptic number.

It is an amenable number.

809812 is a deficient number, since it is larger than the sum of its proper divisors (690848).

809812 is a wasteful number, since it uses less digits than its factorization.

809812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11930 (or 11928 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 809812 is about 899.8955494945. The cubic root of 809812 is about 93.2097627723.

The spelling of 809812 in words is "eight hundred nine thousand, eight hundred twelve".