865216 has 28 divisors (see below), whose sum is σ = 1874520. Its totient is φ = 392960.

The previous prime is 865213. The next prime is 865217. The reversal of 865216 is 612568.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90 + ... + 1318.

2⁸⁶⁵²¹⁶ 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 865216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937260).

865216 is an abundant number, since it is smaller than the sum of its proper divisors (1009304).

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

865216 is a wasteful number, since it uses less digits than its factorization.

865216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 1242 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 865216 is about 930.1698769580. The cubic root of 865216 is about 95.2887245723.

It can be divided in two parts, 8652 and 16, that added together give a palindrome (8668).

The spelling of 865216 in words is "eight hundred sixty-five thousand, two hundred sixteen".