858812 has 12 divisors (see below), whose sum is σ = 1531656. Its totient is φ = 421200.

The previous prime is 858787. The next prime is 858817. The reversal of 858812 is 218858.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 858812.

It is not an unprimeable number, because it can be changed into a prime (858817) by changing a digit.

858812 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 1814 + ... + 2237.

It is an arithmetic number, because the mean of its divisors is an integer number (127638).

2⁸⁵⁸⁸¹² is an apocalyptic number.

It is an amenable number.

858812 is a deficient number, since it is larger than the sum of its proper divisors (672844).

858812 is a wasteful number, since it uses less digits than its factorization.

858812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108 (or 4106 counting only the distinct ones).

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

The square root of 858812 is about 926.7211015187. The cubic root of 858812 is about 95.0530451679.

It can be divided in two parts, 858 and 812, that multiplied together give a palindrome (696696).

The spelling of 858812 in words is "eight hundred fifty-eight thousand, eight hundred twelve".