Hex #399d39 or rgb(57,157,57) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 62 and saturation = 64. #399d39 can be obtained by mixing 3 colors: 5 drops of green, 2 drops of white, 2 drops of black.
Nearest safe hex - #339933. Below you can see the block with #399d39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #399d39 to the mixer and play with it.