865359 has 12 divisors (see below), whose sum is σ = 1363752. Its totient is φ = 524400.

The previous prime is 865357. The next prime is 865363. The reversal of 865359 is 953568.

It is not a de Polignac number, because 865359 - 2¹ = 865357 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865359.

It is not an unprimeable number, because it can be changed into a prime (865357) 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 11 ways as a sum of consecutive naturals, for example, 4272 + ... + 4469.

It is an arithmetic number, because the mean of its divisors is an integer number (113646).

2⁸⁶⁵³⁵⁹ is an apocalyptic number.

865359 is a deficient number, since it is larger than the sum of its proper divisors (498393).

865359 is a wasteful number, since it uses less digits than its factorization.

865359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8758 (or 8755 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 865359 is about 930.2467414616. The cubic root of 865359 is about 95.2939739501.

Subtracting 865359 from its reverse (953568), we obtain a square (88209 = 297²).

It can be divided in two parts, 86 and 5359, that added together give a palindrome (5445).

The spelling of 865359 in words is "eight hundred sixty-five thousand, three hundred fifty-nine".