Hex #154a39 or rgb(21,74,57) in RGB space is the tint of greenish cian. It has hue angle of 160.75 degrees, value = 29 and saturation = 72. #154a39 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 2 drops of green, 5 drops of black.
Nearest safe hex - #003333. Below you can see the block with #154a39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #154a39 to the mixer and play with it.