866811 has 8 divisors (see below), whose sum is σ = 1260864. Its totient is φ = 525320.

The previous prime is 866783. The next prime is 866819. The reversal of 866811 is 118668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866811 - 2⁷ = 866683 is a prime.

It is a super-2 number, since 2×866811² = 1502722619442, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866811.

It is not an unprimeable number, because it can be changed into a prime (866819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13101 + ... + 13166.

It is an arithmetic number, because the mean of its divisors is an integer number (157608).

2⁸⁶⁶⁸¹¹ is an apocalyptic number.

866811 is a deficient number, since it is larger than the sum of its proper divisors (394053).

866811 is a wasteful number, since it uses less digits than its factorization.

866811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26281.

The product of its digits is 2304, while the sum is 30.

The square root of 866811 is about 931.0268524592. The cubic root of 866811 is about 95.3472426062.

The spelling of 866811 in words is "eight hundred sixty-six thousand, eight hundred eleven".