870858 has 16 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 290268.

The previous prime is 870853. The next prime is 870871. The reversal of 870858 is 858078.

870858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (870853) by changing a digit.

870858 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 7 ways as a sum of consecutive naturals, for example, 8010 + ... + 8117.

It is an arithmetic number, because the mean of its divisors is an integer number (120960).

2⁸⁷⁰⁸⁵⁸ is an apocalyptic number.

870858 is an abundant number, since it is smaller than the sum of its proper divisors (1064502).

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

870858 is a wasteful number, since it uses less digits than its factorization.

870858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16138 (or 16132 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 870858 is about 933.1977282441. The cubic root of 870858 is about 95.4953992100.

It can be divided in two parts, 870 and 858, that added together give a cube (1728 = 12³).

The spelling of 870858 in words is "eight hundred seventy thousand, eight hundred fifty-eight".