865884 has 24 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 283504.

The previous prime is 865877. The next prime is 865889. The reversal of 865884 is 488568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865889) by changing a digit.

865884 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (85680).

2⁸⁶⁵⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

865884 is an abundant number, since it is smaller than the sum of its proper divisors (1190436).

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

865884 is a wasteful number, since it uses less digits than its factorization.

865884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289 (or 1287 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 865884 is about 930.5288818731. The cubic root of 865884 is about 95.3132411839.

The spelling of 865884 in words is "eight hundred sixty-five thousand, eight hundred eighty-four".