825865 has 4 divisors (see below), whose sum is σ = 991044. Its totient is φ = 660688.

The previous prime is 825857. The next prime is 825883. The reversal of 825865 is 568528.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219024 + 606841 = 468^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 825865 - 2³ = 825857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 825865.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82582 + ... + 82591.

It is an arithmetic number, because the mean of its divisors is an integer number (247761).

2⁸²⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

825865 is a deficient number, since it is larger than the sum of its proper divisors (165179).

825865 is a wasteful number, since it uses less digits than its factorization.

825865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165178.

The product of its digits is 19200, while the sum is 34.

The square root of 825865 is about 908.7711483096. The cubic root of 825865 is about 93.8216400564.

The spelling of 825865 in words is "eight hundred twenty-five thousand, eight hundred sixty-five".