865224 has 48 divisors (see below), whose sum is σ = 2393820. Its totient is φ = 282240.

The previous prime is 865217. The next prime is 865231. The reversal of 865224 is 422568.

865224 is a `hidden beast` number, since 8 + 652 + 2 + 4 = 666.

865224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (865217) and next prime (865231).

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 324 = 930^2 + 18^2 .

It is a super-2 number, since 2×865224² = 1497225140352, which contains 22 as substring.

It is an unprimeable number.

865224 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4294 + ... + 4490.

2⁸⁶⁵²²⁴ 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 865224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1196910).

865224 is an abundant number, since it is smaller than the sum of its proper divisors (1528596).

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

865224 is a wasteful number, since it uses less digits than its factorization.

865224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 263 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 865224 is about 930.1741772378. The cubic root of 865224 is about 95.2890182591.

It can be divided in two parts, 865 and 224, that added together give a square (1089 = 33²).

The spelling of 865224 in words is "eight hundred sixty-five thousand, two hundred twenty-four".