1722

Number
$1722$ (one thousand, seven hundred and twenty-two) is:


 * $2 \times 3 \times 7 \times 41$


 * The $3$rd Giuga number:
 * $\dfrac 1 2 + \dfrac 1 3 + \dfrac 1 7 + \dfrac 1 {41} - \dfrac 1 {1722} = 1$