Hex #404b4b or rgb(64,75,75) in RGB space is the tint of cyan. It has hue angle of 180.00 degrees, value = 29 and saturation = 15. #404b4b can be obtained by mixing 4 colors: 2 drops of magenta, 1 drop of cyan, 2 drops of green, 3 drops of black.
Nearest safe hex - #333333. Below you can see the block with #404b4b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #404b4b to the mixer and play with it.