4,490,639

Number
$4 \, 490 \, 639$ (four million, four hundred and ninety thousand, six hundred and thirty-nine) is:


 * The $315 \, 347$th prime number


 * The $3$rd term of the smallest Cunningham chain of the first kind of length $7$:
 * $1 \, 122 \, 659$, $2 \, 245 \, 319$, $4 \, 490 \, 639$, $8 \, 981 \, 279$, $17 \, 962 \, 559$, $35 \, 925 \, 119$, $71 \, 850 \, 239$