Hex #399dc7 or rgb(57,157,199) in RGB space is the tint of bluish cian. It has hue angle of 197.75 degrees, value = 78 and saturation = 71. #399dc7 can be obtained by mixing 4 colors: 1 drop of red, 3 drops of blue, 4 drops of cyan, 1 drop of white.
Nearest safe hex - #3399cc. Below you can see the block with #399dc7 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #399dc7 to the mixer and play with it.