Hex #399939 or rgb(57,153,57) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 60 and saturation = 63. #399939 can be obtained by mixing 3 colors: 2 drops of red, 2 drops of cyan, 5 drops of green.
Nearest safe hex - #339933. Below you can see the block with #399939 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #399939 to the mixer and play with it.