866825 has 6 divisors (see below), whose sum is σ = 1074894. Its totient is φ = 693440.

The previous prime is 866819. The next prime is 866843. The reversal of 866825 is 528668.

It can be written as a sum of positive squares in 3 ways, for example, as 64 + 866761 = 8^2 + 931^2 .

It is not a de Polignac number, because 866825 - 2¹⁰ = 865801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17312 + ... + 17361.

It is an arithmetic number, because the mean of its divisors is an integer number (179149).

2⁸⁶⁶⁸²⁵ is an apocalyptic number.

It is an amenable number.

866825 is a deficient number, since it is larger than the sum of its proper divisors (208069).

866825 is a wasteful number, since it uses less digits than its factorization.

866825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34683 (or 34678 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 866825 is about 931.0343710089. The cubic root of 866825 is about 95.3477559262.

The spelling of 866825 in words is "eight hundred sixty-six thousand, eight hundred twenty-five".