Hex #399e8e or rgb(57,158,142) in RGB space is the tint of greenish cian. It has hue angle of 170.50 degrees, value = 62 and saturation = 64. #399e8e can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of red, 5 drops of cyan, 2 drops of black.
Nearest safe hex - #339999. Below you can see the block with #399e8e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #399e8e to the mixer and play with it.