Hex #40639d or rgb(64,99,157) in RGB space is the tint of blue. It has hue angle of 217.42 degrees, value = 62 and saturation = 59. #40639d can be obtained by mixing 4 colors: 3 drops of magenta, 5 drops of blue, 2 drops of cyan, 2 drops of green.
Nearest safe hex - #336699. Below you can see the block with #40639d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40639d to the mixer and play with it.