865218 has 8 divisors (see below), whose sum is σ = 1730448. Its totient is φ = 288404.

The previous prime is 865217. The next prime is 865231. The reversal of 865218 is 812568.

865218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

865218 is an admirable number.

It is a Curzon 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, 72096 + ... + 72107.

It is an arithmetic number, because the mean of its divisors is an integer number (216306).

2⁸⁶⁵²¹⁸ is an apocalyptic number.

865218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

865218 is a wasteful number, since it uses less digits than its factorization.

865218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144208.

The product of its digits is 3840, while the sum is 30.

The square root of 865218 is about 930.1709520298. The cubic root of 865218 is about 95.2887979942.

Subtracting from 865218 its reverse (812568), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 865218 in words is "eight hundred sixty-five thousand, two hundred eighteen".