206686 has 8 divisors (see below), whose sum is σ = 328320. Its totient is φ = 97248.

The previous prime is 206651. The next prime is 206699. The reversal of 206686 is 686602.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3006 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2²⁰⁶⁶⁸⁶ is an apocalyptic number.

206686 is a deficient number, since it is larger than the sum of its proper divisors (121634).

206686 is a wasteful number, since it uses less digits than its factorization.

206686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6098.

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

The square root of 206686 is about 454.6273199006. The cubic root of 206686 is about 59.1248910510.

The spelling of 206686 in words is "two hundred six thousand, six hundred eighty-six".