866838 has 16 divisors (see below), whose sum is σ = 1981440. Its totient is φ = 247656.

The previous prime is 866819. The next prime is 866843. The reversal of 866838 is 838668.

866838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 866796 and 866805.

It is a congruent number.

It is an unprimeable number.

866838 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 7 ways as a sum of consecutive naturals, for example, 10278 + ... + 10361.

It is an arithmetic number, because the mean of its divisors is an integer number (123840).

2⁸⁶⁶⁸³⁸ is an apocalyptic number.

866838 is an abundant number, since it is smaller than the sum of its proper divisors (1114602).

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

866838 is a wasteful number, since it uses less digits than its factorization.

866838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20651.

The product of its digits is 55296, while the sum is 39.

The square root of 866838 is about 931.0413524651. The cubic root of 866838 is about 95.3482325755.

The spelling of 866838 in words is "eight hundred sixty-six thousand, eight hundred thirty-eight".