Hex #407b2b or rgb(64,123,43) in RGB space is the tint of grass green. It has hue angle of 104.25 degrees, value = 48 and saturation = 65. #407b2b can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of green, 2 drops of white, 5 drops of black.
Nearest safe hex - #336633. Below you can see the block with #407b2b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #407b2b to the mixer and play with it.