206389 has 4 divisors (see below), whose sum is σ = 207756. Its totient is φ = 205024.

The previous prime is 206383. The next prime is 206399. The reversal of 206389 is 983602.

206389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152100 + 54289 = 390^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 206389 - 2¹³ = 198197 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 (206383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (51939).

2²⁰⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

206389 is a deficient number, since it is larger than the sum of its proper divisors (1367).

206389 is a wasteful number, since it uses less digits than its factorization.

206389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 206389 is about 454.3005613028. The cubic root of 206389 is about 59.0965573945.

Adding to 206389 its product of nonzero digits (2592), we get a triangular number (208981 = T₆₄₆).

It can be divided in two parts, 206 and 389, that added together give a palindrome (595).

The spelling of 206389 in words is "two hundred six thousand, three hundred eighty-nine".