866085 has 32 divisors (see below), whose sum is σ = 1572480. Its totient is φ = 403200.

The previous prime is 866083. The next prime is 866087. The reversal of 866085 is 580668.

It is an interprime number because it is at equal distance from previous prime (866083) and next prime (866087).

It is not a de Polignac number, because 866085 - 2¹ = 866083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866081) 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 31 ways as a sum of consecutive naturals, for example, 4695 + ... + 4875.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2⁸⁶⁶⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

866085 is a deficient number, since it is larger than the sum of its proper divisors (706395).

866085 is a wasteful number, since it uses less digits than its factorization.

866085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 866085 is about 930.6368787019. The cubic root of 866085 is about 95.3206157203.

The spelling of 866085 in words is "eight hundred sixty-six thousand, eighty-five".