866743 has 2 divisors, whose sum is σ = 866744. Its totient is φ = 866742.

The previous prime is 866737. The next prime is 866759. The reversal of 866743 is 347668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866743 - 2⁹ = 866231 is a prime.

866743 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 866699 and 866708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433371 + 433372.

It is an arithmetic number, because the mean of its divisors is an integer number (433372).

2⁸⁶⁶⁷⁴³ is an apocalyptic number.

866743 is a deficient number, since it is larger than the sum of its proper divisors (1).

866743 is an equidigital number, since it uses as much as digits as its factorization.

866743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 866743 is about 930.9903329251. The cubic root of 866743 is about 95.3447492591.

The spelling of 866743 in words is "eight hundred sixty-six thousand, seven hundred forty-three".