866359 has 4 divisors (see below), whose sum is σ = 933016. Its totient is φ = 799704.

The previous prime is 866353. The next prime is 866389. The reversal of 866359 is 953668.

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

It is a cyclic number.

It is not a de Polignac number, because 866359 - 2⁷ = 866231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866353) 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 3 ways as a sum of consecutive naturals, for example, 33309 + ... + 33334.

It is an arithmetic number, because the mean of its divisors is an integer number (233254).

2⁸⁶⁶³⁵⁹ is an apocalyptic number.

866359 is a deficient number, since it is larger than the sum of its proper divisors (66657).

866359 is a wasteful number, since it uses less digits than its factorization.

866359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66656.

The product of its digits is 38880, while the sum is 37.

The square root of 866359 is about 930.7840780761. The cubic root of 866359 is about 95.3306667334.

It can be divided in two parts, 866 and 359, that added together give a triangular number (1225 = T₄₉).

The spelling of 866359 in words is "eight hundred sixty-six thousand, three hundred fifty-nine".