866826 has 12 divisors (see below), whose sum is σ = 1878162. Its totient is φ = 288936.

The previous prime is 866819. The next prime is 866843. The reversal of 866826 is 628668.

It can be written as a sum of positive squares in only one way, i.e., 488601 + 378225 = 699^2 + 615^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866826.

It is an unprimeable number.

866826 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 5 ways as a sum of consecutive naturals, for example, 24061 + ... + 24096.

2⁸⁶⁶⁸²⁶ is an apocalyptic number.

866826 is an abundant number, since it is smaller than the sum of its proper divisors (1011336).

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

866826 is a wasteful number, since it uses less digits than its factorization.

866826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48165 (or 48162 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 866826 is about 931.0349080459. The cubic root of 866826 is about 95.3477925917.

The spelling of 866826 in words is "eight hundred sixty-six thousand, eight hundred twenty-six".