Hex #40b140 or rgb(64,177,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 69 and saturation = 64. #40b140 can be obtained by mixing 3 colors: 5 drops of green, 2 drops of white, 1 drop of black.
Nearest safe hex - #339933. Below you can see the block with #40b140 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40b140 to the mixer and play with it.