866475 has 18 divisors (see below), whose sum is σ = 1552356. Its totient is φ = 462000.

The previous prime is 866471. The next prime is 866477. The reversal of 866475 is 574668.

It is a happy number.

866475 is a `hidden beast` number, since 8 + 6 + 647 + 5 = 666.

It is not a de Polignac number, because 866475 - 2² = 866471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866471) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 1701 + ... + 2150.

It is an arithmetic number, because the mean of its divisors is an integer number (86242).

2⁸⁶⁶⁴⁷⁵ is an apocalyptic number.

866475 is a deficient number, since it is larger than the sum of its proper divisors (685881).

866475 is a wasteful number, since it uses less digits than its factorization.

866475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3867 (or 3859 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 866475 is about 930.8463890460. The cubic root of 866475 is about 95.3349212683.

It can be divided in two parts, 86 and 6475, that added together give a 8-th power (6561 = 3⁸).

The spelling of 866475 in words is "eight hundred sixty-six thousand, four hundred seventy-five".