858212 has 12 divisors (see below), whose sum is σ = 1538796. Its totient is φ = 418560.

The previous prime is 858167. The next prime is 858217. The reversal of 858212 is 212858.

It can be written as a sum of positive squares in 2 ways, for example, as 440896 + 417316 = 664^2 + 646^2 .

It is not an unprimeable number, because it can be changed into a prime (858217) by changing a digit.

858212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2453 + ... + 2780.

It is an arithmetic number, because the mean of its divisors is an integer number (128233).

2⁸⁵⁸²¹² is an apocalyptic number.

858212 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

858212 is a deficient number, since it is larger than the sum of its proper divisors (680584).

858212 is a wasteful number, since it uses less digits than its factorization.

858212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278 (or 5276 counting only the distinct ones).

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

The square root of 858212 is about 926.3973229668. The cubic root of 858212 is about 95.0309040731.

The spelling of 858212 in words is "eight hundred fifty-eight thousand, two hundred twelve".