How many grams per cubic centimeter is 1400 liters?

That depends upon the substance that makes up the 1400 liters, and at what temperature and pressure that substance is.

What you are asking for is the density of the substance as that can be measured in grams/cu cm. The volume of the substance makes no different as the density is constant (at a given temperature and pressure).

If you had 1400 liters of Mercury (at 0°C, 101.325 kPa), it would be 13.534 g per cu cm.

If you had 1400 liters of hydrogen (at 0°C, 101.325 kPa), it would be 0.00008988 g per cu cm.

If you had 1400 liters of water (at 0°C, 101.325 kPa), it would be 0.9998675 g per cu cm (which is near enough 1 g per cu cm).

Water is its densest at 4°C, when it is 0.9999999985 g per cu cm.