It's about one-two-thousand-five-hundredth as heavy as The Eiffel Tower
In other words, 0.00000400 megatonnes is 0.000396 times the weight of The Eiffel Tower, and the weight of The Eiffel Tower is 2,530 times that amount.(a.k.a. La Tour Eiffel) (Paris, France) (total weight)
The Eiffel Tower weighs approximately 0.0101 megatonnes. Architected to be quickly assembled, the Tower contains only 930 cu. meters of solid material.
It's about 3,000 times as heavy as a Human Brain
In other words, 0.00000400 megatonnes is 2,960 times the weight of a Human Brain, and the weight of a Human Brain is 0.000338 times that amount.(adult)
The average weight of an adult human brain is between 0.000000001350 megatonnes. 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.
It's about one-three-thousand-five-hundredth as heavy as The Brooklyn Bridge
In other words, 0.00000400 megatonnes is 0.0003003 times the weight of The Brooklyn Bridge, and the weight of The Brooklyn Bridge is 3,330 times that amount.(a.k.a. New York and Brooklyn Bridge) (Manhattan and Brooklyn, New York City, New York) (total weight)
The total weight of the Brooklyn Bridge is approximately 0.01332 megatonnes. In a promotional event to prove the bridge's stability shortly after it opened, entertainer P. T. Barnum led a parade of 21 elephants across it in May of 1884.
It's about 4,000 times as heavy as a liter of Water
In other words, 0.00000400 megatonnes is 3,999.8880 times the weight of a liter of Water, and the weight of a liter of Water is 0.000250007 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 0.0000000010000280 megatonnes 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-six-thousandth as heavy as The Statue of Liberty
In other words, 0.00000400 megatonnes is 0.000162 times the weight of The Statue of Liberty, and the weight of The Statue of Liberty is 6,170 times that amount.(a.k.a. Liberty Enlightening the World, a.k.a. La Liberté éclairant le monde) (total weight, including foundation)
The total weight of the Statue of Liberty, including her base is roughly 0.0246 megatonnes. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.
It's about 6,500 times as heavy as a Basketball
In other words, 0.00000400 megatonnes is 6,413.44762720 times the weight of a Basketball, and the weight of a Basketball is 0.00015592237719 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 0.000000000623689508750 megatonnes. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about 9,500 times as heavy as a Football (Soccer)
In other words, the weight of a Football (Soccer) is 0.00011 times 0.00000400 megatonnes.(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 0.000000000410 megatonnes and 0.000000000450 megatonnes. 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.