It's about as heavy as a Football (American).
In other words, the weight of a Football (American) is 1.035714285714 times 396.89332375 grams.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 396.89332375 g and 425.242846875 g. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
It's about nine-tenths as heavy as a Football (Soccer).
In other words, 396.89332375 grams is 0.92 times the weight of a Football (Soccer), and the weight of a Football (Soccer) is 1.1 times that amount.(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 410 g and 450 g. An artifact on display at the Smith Art Gallery in Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
It's about one-and-one-tenth times as heavy as a Can of Soup.
In other words, the weight of a Can of Soup is 0.91 times 396.89332375 grams.(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 350 g. Cans have been used to store soup and other foods since their invention in 1913, but a dedicated can opener was not developed until cans began to use thinner materials — prior to that time, cans were usually opened using various blunt instruments and tools.
It's about one-and-three-tenths times as heavy as a Human Heart.
It's about two-thirds as heavy as a Basketball.
In other words, 396.89332375 grams is 0.63636363636 times the weight of a Basketball, and the weight of a Basketball is 1.5714285714 times that amount.(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 623.68950875 g. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about two times as heavy as a Hamster.
In other words, the weight of a Hamster is 0.5 times 396.89332375 grams.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 200 g. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 30,000 grams of food in their borrows.
It's about two-and-a-half times as heavy as a Billiard Ball.
In other words, 396.89332375 grams is 2.4347826086957 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.41071428571428 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 155.9223771875 g and 170.09713875 g. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.