865312 has 24 divisors (see below), whose sum is σ = 1947456. Its totient is φ = 370752.

The previous prime is 865307. The next prime is 865313. The reversal of 865312 is 213568.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (865313) by changing a digit.

865312 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708 + ... + 2155.

It is an arithmetic number, because the mean of its divisors is an integer number (81144).

2⁸⁶⁵³¹² is an apocalyptic number.

It is an amenable number.

865312 is an abundant number, since it is smaller than the sum of its proper divisors (1082144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865312 is a wasteful number, since it uses less digits than its factorization.

865312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880 (or 3872 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 865312 is about 930.2214790038. The cubic root of 865312 is about 95.2922486940.

The spelling of 865312 in words is "eight hundred sixty-five thousand, three hundred twelve".