866875 has 20 divisors (see below), whose sum is σ = 1155880. Its totient is φ = 648000.

The previous prime is 866869. The next prime is 866909. The reversal of 866875 is 578668.

It is not a de Polignac number, because 866875 - 2⁵ = 866843 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

Its product of digits (80640) is a multiple of the sum of its prime factors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11839 + ... + 11911.

It is an arithmetic number, because the mean of its divisors is an integer number (57794).

2⁸⁶⁶⁸⁷⁵ is an apocalyptic number.

866875 is a deficient number, since it is larger than the sum of its proper divisors (289005).

866875 is an equidigital number, since it uses as much as digits as its factorization.

866875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 97 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 866875 is about 931.0612224768. The cubic root of 866875 is about 95.3495891667.

The spelling of 866875 in words is "eight hundred sixty-six thousand, eight hundred seventy-five".