866525 has 24 divisors (see below), whose sum is σ = 1232064. Its totient is φ = 598400.

The previous prime is 866519. The next prime is 866573. The reversal of 866525 is 525668.

866525 = 1² + 2² + ... + 137².

It is a happy number.

It is not a de Polignac number, because 866525 - 2⁶ = 866461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866491 and 866500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6257 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (51336).

2⁸⁶⁶⁵²⁵ is an apocalyptic number.

It is an amenable number.

866525 is a deficient number, since it is larger than the sum of its proper divisors (365539).

866525 is a wasteful number, since it uses less digits than its factorization.

866525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 176 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 866525 is about 930.8732459363. The cubic root of 866525 is about 95.3367550024.

The spelling of 866525 in words is "eight hundred sixty-six thousand, five hundred twenty-five".