208139 has 2 divisors, whose sum is σ = 208140. Its totient is φ = 208138.

The previous prime is 208129. The next prime is 208141. The reversal of 208139 is 931802.

208139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208139 is a prime.

Together with 208141, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 208139.

It is not a weakly prime, because it can be changed into another prime (208129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104069 + 104070.

It is an arithmetic number, because the mean of its divisors is an integer number (104070).

2²⁰⁸¹³⁹ is an apocalyptic number.

208139 is a deficient number, since it is larger than the sum of its proper divisors (1).

208139 is an equidigital number, since it uses as much as digits as its factorization.

208139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 208139 is about 456.2225334198. Note that the first 3 decimals coincide. The cubic root of 208139 is about 59.2631167290.

The spelling of 208139 in words is "two hundred eight thousand, one hundred thirty-nine".