858872 has 32 divisors (see below), whose sum is σ = 1884000. Its totient is φ = 366912.

The previous prime is 858859. The next prime is 858877. The reversal of 858872 is 278858.

It is a super-2 number, since 2×858872² = 1475322224768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858877) by changing a digit.

858872 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 7 ways as a sum of consecutive naturals, for example, 2588 + ... + 2900.

It is an arithmetic number, because the mean of its divisors is an integer number (58875).

2⁸⁵⁸⁸⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 858872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942000).

858872 is an abundant number, since it is smaller than the sum of its proper divisors (1025128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

858872 is a wasteful number, since it uses less digits than its factorization.

858872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 322 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 858872 is about 926.7534731524. The cubic root of 858872 is about 95.0552587101.

The spelling of 858872 in words is "eight hundred fifty-eight thousand, eight hundred seventy-two".