865725 has 48 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 368640.

The previous prime is 865721. The next prime is 865729. The reversal of 865725 is 527568.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (865721) and next prime (865729).

It is not a de Polignac number, because 865725 - 2² = 865721 is a prime.

865725 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8877 + ... + 8973.

It is an arithmetic number, because the mean of its divisors is an integer number (36456).

2⁸⁶⁵⁷²⁵ is an apocalyptic number.

865725 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

865725 is an abundant number, since it is smaller than the sum of its proper divisors (884163).

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

865725 is a wasteful number, since it uses less digits than its factorization.

865725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 129 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 865725 is about 930.4434426659. The cubic root of 865725 is about 95.3074067869.

The spelling of 865725 in words is "eight hundred sixty-five thousand, seven hundred twenty-five".