Hex #173b4e or rgb(23,59,78) in RGB space is the tint of bluish cian. It has hue angle of 200.73 degrees, value = 31 and saturation = 71. #173b4e can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 2 drops of green, 4 drops of black.
Nearest safe hex - #003366. Below you can see the block with #173b4e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #173b4e to the mixer and play with it.