343

Number
$343$ (three hundred and forty-three) is:


 * $7^3$


 * The $7$th cube number after $1, 8, 27, 64, 125, 216$:
 * $343 = 7 \times 7 \times 7$


 * The $18$th number after $1, 3, 22, 66, 70, 81, 94, 115, 119, 170, 210, 214, 217, 265, 282, 310, 322$, and the $1$st cube, whose $\sigma$ value is square: