856975 has 24 divisors (see below), whose sum is σ = 1249920. Its totient is φ = 570720.

The previous prime is 856969. The next prime is 856993. The reversal of 856975 is 579658.

It is a happy number.

It is not a de Polignac number, because 856975 - 2⁵ = 856943 is a prime.

It is a congruent number.

It is an unprimeable 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 23 ways as a sum of consecutive naturals, for example, 10284 + ... + 10366.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2⁸⁵⁶⁹⁷⁵ is an apocalyptic number.

856975 is a deficient number, since it is larger than the sum of its proper divisors (392945).

856975 is a wasteful number, since it uses less digits than its factorization.

856975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 154 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The square root of 856975 is about 925.7294421158. The cubic root of 856975 is about 94.9852239253.

The spelling of 856975 in words is "eight hundred fifty-six thousand, nine hundred seventy-five".