Hex #404547 or rgb(64,69,71) in RGB space is the tint of bluish cian. It has hue angle of 197.14 degrees, value = 28 and saturation = 10. #404547 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of red, 5 drops of blue, 4 drops of black.
Nearest safe hex - #333333. Below you can see the block with #404547 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #404547 to the mixer and play with it.