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6174 is known as Kaprekar's constant as it was invented by Indian mathematician DR Kaprekar in 1949.
Even mathematicians, till date, aren't sure how to explain this magic number. Wondering, what's so unique about the number? This number is known for the following rule:...
It was only in 1970 that people started recognizing Kaprekar's work after America's best selling author, Martin Gardner wrote an article on Kaprekar in a magazine titled
'Scientific America'. Today, Kaprekar's contribution in the field of mathematics is known to the entire world.
Source: ScoopWhoop