812845 has 8 divisors (see below), whose sum is σ = 1064160. Its totient is φ = 591120.

The previous prime is 812807. The next prime is 812849. The reversal of 812845 is 548218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 812845 - 2⁷ = 812717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812849) 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 7 ways as a sum of consecutive naturals, for example, 7335 + ... + 7444.

It is an arithmetic number, because the mean of its divisors is an integer number (133020).

2⁸¹²⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

812845 is a deficient number, since it is larger than the sum of its proper divisors (251315).

812845 is a wasteful number, since it uses less digits than its factorization.

812845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14795.

The product of its digits is 2560, while the sum is 28.

The square root of 812845 is about 901.5791701232. The cubic root of 812845 is about 93.3259843987.

It can be divided in two parts, 81 and 2845, that added together give a triangular number (2926 = T₇₆).

The spelling of 812845 in words is "eight hundred twelve thousand, eight hundred forty-five".