865212 has 12 divisors (see below), whose sum is σ = 2018856. Its totient is φ = 288400.

The previous prime is 865211. The next prime is 865213. The reversal of 865212 is 212568.

It is an interprime number because it is at equal distance from previous prime (865211) and next prime (865213).

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

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, 36039 + ... + 36062.

It is an arithmetic number, because the mean of its divisors is an integer number (168238).

2⁸⁶⁵²¹² is an apocalyptic number.

It is an amenable number.

865212 is an abundant number, since it is smaller than the sum of its proper divisors (1153644).

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

865212 is a wasteful number, since it uses less digits than its factorization.

865212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72108 (or 72106 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 865212 is about 930.1677268106. The cubic root of 865212 is about 95.2885777283.

The spelling of 865212 in words is "eight hundred sixty-five thousand, two hundred twelve".