812853 has 12 divisors (see below), whose sum is σ = 1206348. Its totient is φ = 527040.

The previous prime is 812849. The next prime is 812857. The reversal of 812853 is 358218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (812849) and next prime (812857).

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 412164 = 633^2 + 642^2 .

It is not a de Polignac number, because 812853 - 2² = 812849 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812857) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 888 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (100529).

2⁸¹²⁸⁵³ is an apocalyptic number.

It is an amenable number.

812853 is a deficient number, since it is larger than the sum of its proper divisors (393495).

812853 is a wasteful number, since it uses less digits than its factorization.

812853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484 (or 2481 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 812853 is about 901.5836067720. The cubic root of 812853 is about 93.3262905684.

The spelling of 812853 in words is "eight hundred twelve thousand, eight hundred fifty-three".