Hex #405040 or rgb(64,80,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 31 and saturation = 20. #405040 can be obtained by mixing 4 colors: 3 drops of magenta, 1 drop of cyan, 4 drops of green, 4 drops of black.
Nearest safe hex - #336633. Below you can see the block with #405040 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #405040 to the mixer and play with it.