866206 has 8 divisors (see below), whose sum is σ = 1417464. Its totient is φ = 393720.

The previous prime is 866197. The next prime is 866213. The reversal of 866206 is 602668.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 19665 + ... + 19708.

It is an arithmetic number, because the mean of its divisors is an integer number (177183).

2⁸⁶⁶²⁰⁶ is an apocalyptic number.

866206 is a deficient number, since it is larger than the sum of its proper divisors (551258).

866206 is a wasteful number, since it uses less digits than its factorization.

866206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39386.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 866206 is about 930.7018856755. The cubic root of 866206 is about 95.3250545677.

The spelling of 866206 in words is "eight hundred sixty-six thousand, two hundred six".