812285 has 4 divisors (see below), whose sum is σ = 974748. Its totient is φ = 649824.

The previous prime is 812281. The next prime is 812297. The reversal of 812285 is 582218.

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 273529 + 538756 = 523^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 812285 - 2² = 812281 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81224 + ... + 81233.

It is an arithmetic number, because the mean of its divisors is an integer number (243687).

2⁸¹²²⁸⁵ is an apocalyptic number.

It is an amenable number.

812285 is a deficient number, since it is larger than the sum of its proper divisors (162463).

812285 is a wasteful number, since it uses less digits than its factorization.

812285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162462.

The product of its digits is 1280, while the sum is 26.

The square root of 812285 is about 901.2685504332. The cubic root of 812285 is about 93.3045475287.

The spelling of 812285 in words is "eight hundred twelve thousand, two hundred eighty-five".