Hex #39811c or rgb(57,129,28) in RGB space is the tint of grass green. It has hue angle of 102.77 degrees, value = 51 and saturation = 78. #39811c can be obtained by mixing 4 colors: 1 drop of red, 5 drops of green, 1 drop of white, 2 drops of black.
Nearest safe hex - #339933. Below you can see the block with #39811c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #39811c to the mixer and play with it.