866786 has 4 divisors (see below), whose sum is σ = 1300182. Its totient is φ = 433392.

The previous prime is 866783. The next prime is 866819. The reversal of 866786 is 687668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 25 = 931^2 + 5^2 .

It is an Ulam number.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866786.

It is not an unprimeable number, because it can be changed into a prime (866783) 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 as a sum of consecutive naturals, namely, 216695 + ... + 216698.

2⁸⁶⁶⁷⁸⁶ is an apocalyptic number.

866786 is a deficient number, since it is larger than the sum of its proper divisors (433396).

866786 is a wasteful number, since it uses less digits than its factorization.

866786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433395.

The product of its digits is 96768, while the sum is 41.

The square root of 866786 is about 931.0134263264. The cubic root of 866786 is about 95.3463259497.

The spelling of 866786 in words is "eight hundred sixty-six thousand, seven hundred eighty-six".