It's about as heavy as a Basketball.
(NBA official ball standards, Size 7)
It's about one-and-a-half times as heavy as a Football (Soccer).
In other words, the weight of a Football (Soccer) is 0.67 times 401.04166667 pennyweights.(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
It's about one-and-a-half times as heavy as a Football (American).
In other words, 401.04166667 pennyweights is 1.517241379323 times the weight of a Football (American), and the weight of a Football (American) is 0.6590909090854 times that amount.(a.k.a. "pigskin") (NFL standard)
It's about three-fifths as heavy as a liter of Water.
In other words, 401.04166667 pennyweights is 0.623672 times the weight of a liter of Water, and the weight of a liter of Water is 1.603407 times that amount.(fresh; 4° C / 39.2° F; maximum density)
Contrary to popular belief, 1 liter (0.0.264172052358148 gal) of water at 4° C / 39.2° F (its point of maximum density) weighs 643.0329 pennyweights rather than 1 kg exactly. The total volume of water on the planet Earth is about 13,590,000,000,000,000,000 (13.59 quntillion) L (3,590,000,000,000,000,000 gallons).
It's about one-and-four-fifths times as heavy as a Can of Soup.
In other words, the weight of a Can of Soup is 0.56 times 401.04166667 pennyweights.
It's about two times as heavy as a Human Heart.
In other words, the weight of a Human Heart is 0.5 times 401.04166667 pennyweights.(human; adult)
It's about half as heavy as a Human Brain.
In other words, 401.04166667 pennyweights is 0.462 times the weight of a Human Brain, and the weight of a Human Brain is 2.16 times that amount.(adult)
The average weight of an adult human brain is between 868 pennyweights. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.