866769 has 12 divisors (see below), whose sum is σ = 1189776. Its totient is φ = 561208.

The previous prime is 866759. The next prime is 866777. The reversal of 866769 is 967668.

It is a happy number.

It is not a de Polignac number, because 866769 - 2⁵ = 866737 is a prime.

It is a super-2 number, since 2×866769² = 1502576998722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 866769.

It is not an unprimeable number, because it can be changed into a prime (866759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10402 + ... + 10484.

It is an arithmetic number, because the mean of its divisors is an integer number (99148).

2⁸⁶⁶⁷⁶⁹ is an apocalyptic number.

866769 is the 498-th nonagonal number.

It is an amenable number.

866769 is a deficient number, since it is larger than the sum of its proper divisors (323007).

866769 is an equidigital number, since it uses as much as digits as its factorization.

866769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 145 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 866769 is about 931.0042964455. The cubic root of 866769 is about 95.3457026131.

The spelling of 866769 in words is "eight hundred sixty-six thousand, seven hundred sixty-nine".