385

Number
$385$ (three hundred and eighty-five) is:


 * $5 \times 7 \times 11$


 * The $7$th Cullen number after $1, 3, 9, 25, 65, 161$:
 * $385 = 6 \times 2^6 + 1$


 * The $23$rd number whose $\sigma$ value is square: