Hex #40c840 or rgb(64,200,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 78 and saturation = 68. #40c840 can be obtained by mixing 2 colors: 3 drops of green, 1 drop of white.
Nearest safe hex - #33cc33. Below you can see the block with #40c840 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40c840 to the mixer and play with it.