Hex #397f1c or rgb(57,127,28) in RGB space is the tint of grass green. It has hue angle of 102.42 degrees, value = 50 and saturation = 78. #397f1c can be obtained by mixing 4 colors: 2 drops of red, 1 drop of cyan, 5 drops of green, 1 drop of black.
Nearest safe hex - #336633. Below you can see the block with #397f1c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #397f1c to the mixer and play with it.