1439

Number
$1439$ (one thousand, four hundred and thirty-nine) is:


 * The $228$th prime number.


 * The $5$th term after $89$, $179$, $359$, $719$ of the smallest sequence of $6$ primes formed by doubling and adding one:
 * $\left({89, 179, 359, 719, 1439, 2879}\right)$