Hex #404140 or rgb(64,65,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 25 and saturation = 2. #404140 can be obtained by mixing 4 colors: 3 drops of magenta, 1 drop of cyan, 3 drops of green, 5 drops of black.
Nearest safe hex - #333333. Below you can see the block with #404140 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #404140 to the mixer and play with it.