Hex #403b00 or rgb(64,59,0) in RGB space is the tint of yellow. It has hue angle of 55.31 degrees, value = 25 and saturation = 100. #403b00 can be obtained by mixing 2 colors: 1 drop of yellow, 3 drops of black.
Nearest safe hex - #333300. Below you can see the block with #403b00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #403b00 to the mixer and play with it.