865625 has 12 divisors (see below), whose sum is σ = 1085868. Its totient is φ = 690000.

The previous prime is 865619. The next prime is 865637. The reversal of 865625 is 526568.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 811801 + 53824 = 901^2 + 232^2 .

It is not a de Polignac number, because 865625 - 2⁴ = 865609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 865591 and 865600.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2987 + ... + 3263.

It is an arithmetic number, because the mean of its divisors is an integer number (90489).

2⁸⁶⁵⁶²⁵ is an apocalyptic number.

It is an amenable number.

865625 is a deficient number, since it is larger than the sum of its proper divisors (220243).

865625 is an frugal number, since it uses more digits than its factorization.

865625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 282 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 865625 is about 930.3897032964. The cubic root of 865625 is about 95.3037369889.

The spelling of 865625 in words is "eight hundred sixty-five thousand, six hundred twenty-five".