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In 1949, Indian mathematician and schoolteacher D. R. Kaprekar uncovered one of arithmetic’s most fascinating numerical mysteries: 6174, now famously known as Kaprekar’s Constant. The process is surprisingly simple. Choose any four-digit number containing at least two different digits, arrange its digits from largest to smallest and smallest to largest, then subtract the smaller number from the larger. Repeat the process with each result, keeping any leading zeros, and you’ll always reach 6174 in no more than seven steps. What makes this number extraordinary is what happens next. Once you reach 6174, the process becomes an endless loop: 7641 − 1467 = 6174. No matter how many times you repeat it, the result never changes. More than 75 years after its discovery, Kaprekar’s Constant continues to fascinate mathematicians and curious minds alike, revealing how something as simple as rearranging digits can uncover an astonishing mathematical pattern.