866843 has 2 divisors, whose sum is σ = 866844. Its totient is φ = 866842.

The previous prime is 866819. The next prime is 866849. The reversal of 866843 is 348668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866843 - 2¹⁰ = 865819 is a prime.

It is not a weakly prime, because it can be changed into another prime (866849) 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, 433421 + 433422.

It is an arithmetic number, because the mean of its divisors is an integer number (433422).

2⁸⁶⁶⁸⁴³ is an apocalyptic number.

866843 is a deficient number, since it is larger than the sum of its proper divisors (1).

866843 is an equidigital number, since it uses as much as digits as its factorization.

866843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 35.

The square root of 866843 is about 931.0440376266. The cubic root of 866843 is about 95.3484159009.

The spelling of 866843 in words is "eight hundred sixty-six thousand, eight hundred forty-three".