866625 has 16 divisors (see below), whose sum is σ = 1442688. Its totient is φ = 462000.

The previous prime is 866623. The next prime is 866629. The reversal of 866625 is 526668.

It is not a de Polignac number, because 866625 - 2¹ = 866623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781 + ... + 1530.

It is an arithmetic number, because the mean of its divisors is an integer number (90168).

2⁸⁶⁶⁶²⁵ is an apocalyptic number.

It is an amenable number.

866625 is a deficient number, since it is larger than the sum of its proper divisors (576063).

866625 is a wasteful number, since it uses less digits than its factorization.

866625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329 (or 2319 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 866625 is about 930.9269573925. The cubic root of 866625 is about 95.3404222591.

The spelling of 866625 in words is "eight hundred sixty-six thousand, six hundred twenty-five".