865536 has 108 divisors (see below), whose sum is σ = 2796192. Its totient is φ = 236544.

The previous prime is 865511. The next prime is 865537. The reversal of 865536 is 635568.

It is a junction number, because it is equal to n+sod(n) for n = 865497 and 865506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865537) by changing a digit.

865536 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 11 ways as a sum of consecutive naturals, for example, 37621 + ... + 37643.

2⁸⁶⁵⁵³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1398096).

865536 is an abundant number, since it is smaller than the sum of its proper divisors (1930656).

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

865536 is a wasteful number, since it uses less digits than its factorization.

865536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 35 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 865536 is about 930.3418726468. The cubic root of 865536 is about 95.3004706309.

It can be divided in two parts, 8 and 65536, that multiplied together give a 19-th power (524288 = 2¹⁹).

The spelling of 865536 in words is "eight hundred sixty-five thousand, five hundred thirty-six".