Hex #404f63 or rgb(64,79,99) in RGB space is the tint of blue. It has hue angle of 214.29 degrees, value = 39 and saturation = 35. #404f63 can be obtained by mixing 4 colors: 2 drops of red, 1 drop of magenta, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #336666. Below you can see the block with #404f63 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #404f63 to the mixer and play with it.