206399 has 2 divisors, whose sum is σ = 206400. Its totient is φ = 206398.

The previous prime is 206383. The next prime is 206407. The reversal of 206399 is 993602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206399 - 2⁴ = 206383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206369) by changing a digit.

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 as a sum of consecutive naturals, namely, 103199 + 103200.

It is an arithmetic number, because the mean of its divisors is an integer number (103200).

2²⁰⁶³⁹⁹ is an apocalyptic number.

206399 is a deficient number, since it is larger than the sum of its proper divisors (1).

206399 is an equidigital number, since it uses as much as digits as its factorization.

206399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 206399 is about 454.3115670991. The cubic root of 206399 is about 59.0975118317.

The spelling of 206399 in words is "two hundred six thousand, three hundred ninety-nine".