865172 has 36 divisors (see below), whose sum is σ = 1923936. Its totient is φ = 330720.

The previous prime is 865159. The next prime is 865177. The reversal of 865172 is 271568.

865172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865172.

It is not an unprimeable number, because it can be changed into a prime (865177) by changing a digit.

865172 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, 16298 + ... + 16350.

2⁸⁶⁵¹⁷² 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 865172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961968).

865172 is an abundant number, since it is smaller than the sum of its proper divisors (1058764).

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

865172 is a wasteful number, since it uses less digits than its factorization.

865172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 73 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 865172 is about 930.1462250636. The cubic root of 865172 is about 95.2871092628.

The spelling of 865172 in words is "eight hundred sixty-five thousand, one hundred seventy-two".