812885 has 4 divisors (see below), whose sum is σ = 975468. Its totient is φ = 650304.

The previous prime is 812869. The next prime is 812921. The reversal of 812885 is 588218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 654481 = 398^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 812885 - 2⁴ = 812869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81284 + ... + 81293.

It is an arithmetic number, because the mean of its divisors is an integer number (243867).

2⁸¹²⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

812885 is a deficient number, since it is larger than the sum of its proper divisors (162583).

812885 is a wasteful number, since it uses less digits than its factorization.

812885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162582.

The product of its digits is 5120, while the sum is 32.

The square root of 812885 is about 901.6013531489. The cubic root of 812885 is about 93.3275152269.

The spelling of 812885 in words is "eight hundred twelve thousand, eight hundred eighty-five".