Hex #40af40 or rgb(64,175,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 69 and saturation = 63. #40af40 can be obtained by mixing 4 colors: 1 drop of red, 1 drop of cyan, 5 drops of green, 1 drop of white.
Nearest safe hex - #339933. Below you can see the block with #40af40 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40af40 to the mixer and play with it.