Hex #403f39 or rgb(64,63,57) in RGB space is the tint of khaki. It has hue angle of 51.43 degrees, value = 25 and saturation = 11. #403f39 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of red, 4 drops of blue, 5 drops of black.
Nearest safe hex - #333333. Below you can see the block with #403f39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #403f39 to the mixer and play with it.