Hex #39424c or rgb(57,66,76) in RGB space is the tint of blue. It has hue angle of 211.58 degrees, value = 30 and saturation = 25. #39424c can be obtained by mixing 4 colors: 4 drops of magenta, 4 drops of blue, 5 drops of green, 5 drops of black.
Nearest safe hex - #333333. Below you can see the block with #39424c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #39424c to the mixer and play with it.