Hex #403639 or rgb(64,54,57) in RGB space is the tint of scarlet red. It has hue angle of 342.00 degrees, value = 25 and saturation = 16. #403639 can be obtained by mixing 4 colors: 3 drops of red, 4 drops of blue, 2 drops of green, 3 drops of black.
Nearest safe hex - #333333. Below you can see the block with #403639 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #403639 to the mixer and play with it.