Hex #403615 or rgb(64,54,21) in RGB space is the tint of khaki. It has hue angle of 46.05 degrees, value = 25 and saturation = 67. #403615 can be obtained by mixing 4 colors: 2 drops of red, 1 drop of blue, 2 drops of green, 3 drops of black.
Nearest safe hex - #333300. Below you can see the block with #403615 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #403615 to the mixer and play with it.