Hex #40638b or rgb(64,99,139) in RGB space is the tint of blue. It has hue angle of 212.00 degrees, value = 55 and saturation = 54. #40638b can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 1 drop of green, 1 drop of white.
Nearest safe hex - #336699. Below you can see the block with #40638b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40638b to the mixer and play with it.