Hex #408f20 or rgb(64,143,32) in RGB space is the tint of grass green. It has hue angle of 102.70 degrees, value = 56 and saturation = 78. #408f20 can be obtained by mixing 3 colors: 2 drops of red, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #339933. Below you can see the block with #408f20 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #408f20 to the mixer and play with it.