206439 has 4 divisors (see below), whose sum is σ = 275256. Its totient is φ = 137624.

The previous prime is 206419. The next prime is 206447. The reversal of 206439 is 934602.

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 206439 - 2⁵ = 206407 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206419) 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, 34404 + ... + 34409.

It is an arithmetic number, because the mean of its divisors is an integer number (68814).

2²⁰⁶⁴³⁹ is an apocalyptic number.

206439 is a deficient number, since it is larger than the sum of its proper divisors (68817).

206439 is an equidigital number, since it uses as much as digits as its factorization.

206439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68816.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 206439 is about 454.3555876183. The cubic root of 206439 is about 59.1013292723.

The spelling of 206439 in words is "two hundred six thousand, four hundred thirty-nine".