856870 has 16 divisors (see below), whose sum is σ = 1762848. Its totient is φ = 293760.

The previous prime is 856853. The next prime is 856897. The reversal of 856870 is 78658.

It is a congruent number.

It is an unprimeable number.

856870 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, 6051 + ... + 6190.

It is an arithmetic number, because the mean of its divisors is an integer number (110178).

2⁸⁵⁶⁸⁷⁰ is an apocalyptic number.

856870 is an abundant number, since it is smaller than the sum of its proper divisors (905978).

It is a weird number, because it is abundant, but not a pseudoperfect number.

856870 is a wasteful number, since it uses less digits than its factorization.

856870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12255.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 856870 is about 925.6727283441. The cubic root of 856870 is about 94.9813444439.

The spelling of 856870 in words is "eight hundred fifty-six thousand, eight hundred seventy".