'Ghost number' 6174: Meet Dattatreya Ramchandra Kaprekar, the Indian schoolteacher who discovered a mysterious 4-digit number that almost always returns to itself

Independence Day 2026: Dattatreya Ramchandra Kaprekar, an Indian schoolteacher, discovered the intriguing number 6174. This constant emerges from a simple four-digit number rearrangement process. Repeatedly applying this mathematical routine always leads to the same fixed point. Kaprekar's independent work highlighted how curiosity reveals hidden mathematical patterns. His discoveries gained global recognition through popular science writing.

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