Hex #406a8b or rgb(64,106,139) in RGB space is the tint of blue. It has hue angle of 206.40 degrees, value = 55 and saturation = 54. #406a8b can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of blue, 1 drop of white, 1 drop of black.
Nearest safe hex - #336699. Below you can see the block with #406a8b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #406a8b to the mixer and play with it.