206889 has 4 divisors (see below), whose sum is σ = 275856. Its totient is φ = 137924.

The previous prime is 206887. The next prime is 206897. The reversal of 206889 is 988602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206889 - 2¹ = 206887 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (206887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34479 + ... + 34484.

It is an arithmetic number, because the mean of its divisors is an integer number (68964).

2²⁰⁶⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

206889 is a deficient number, since it is larger than the sum of its proper divisors (68967).

206889 is an equidigital number, since it uses as much as digits as its factorization.

206889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68966.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 206889 is about 454.8505248980. The cubic root of 206889 is about 59.1442415402.

The spelling of 206889 in words is "two hundred six thousand, eight hundred eighty-nine".