866917 has 2 divisors, whose sum is σ = 866918. Its totient is φ = 866916.

The previous prime is 866909. The next prime is 866927. The reversal of 866917 is 719668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763876 + 103041 = 874^2 + 321^2 .

It is a cyclic number.

It is not a de Polignac number, because 866917 - 2³ = 866909 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866927) 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, 433458 + 433459.

It is an arithmetic number, because the mean of its divisors is an integer number (433459).

2⁸⁶⁶⁹¹⁷ is an apocalyptic number.

It is an amenable number.

866917 is a deficient number, since it is larger than the sum of its proper divisors (1).

866917 is an equidigital number, since it uses as much as digits as its factorization.

866917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 866917 is about 931.0837771114. The cubic root of 866917 is about 95.3511290343.

The spelling of 866917 in words is "eight hundred sixty-six thousand, nine hundred seventeen".