866836 has 12 divisors (see below), whose sum is σ = 1558228. Its totient is φ = 421632.

The previous prime is 866819. The next prime is 866843. The reversal of 866836 is 638668.

It can be written as a sum of positive squares in 2 ways, for example, as 799236 + 67600 = 894^2 + 260^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 866795 and 866804.

It is a congruent number.

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, 2781 + ... + 3076.

2⁸⁶⁶⁸³⁶ is an apocalyptic number.

It is an amenable number.

866836 is a deficient number, since it is larger than the sum of its proper divisors (691392).

866836 is a wasteful number, since it uses less digits than its factorization.

866836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5898 (or 5896 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 866836 is about 931.0402783983. The cubic root of 866836 is about 95.3481592452.

The spelling of 866836 in words is "eight hundred sixty-six thousand, eight hundred thirty-six".