809012 has 12 divisors (see below), whose sum is σ = 1450596. Its totient is φ = 394560.

The previous prime is 808993. The next prime is 809023. The reversal of 809012 is 210908.

It can be written as a sum of positive squares in 2 ways, for example, as 126736 + 682276 = 356^2 + 826^2 .

It is a super-2 number, since 2×809012² = 1309000832288, which contains 22 as substring.

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, 2303 + ... + 2630.

It is an arithmetic number, because the mean of its divisors is an integer number (120883).

2⁸⁰⁹⁰¹² is an apocalyptic number.

809012 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

809012 is a deficient number, since it is larger than the sum of its proper divisors (641584).

809012 is a wasteful number, since it uses less digits than its factorization.

809012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978 (or 4976 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 809012 is about 899.4509436317. The cubic root of 809012 is about 93.1790591940.

The spelling of 809012 in words is "eight hundred nine thousand, twelve".