Independence Day 2026: India has produced mathematicians whose ideas have travelled far beyond classrooms and laboratories. Among them was Dattatreya Ramchandra Kaprekar, a schoolteacher from Maharashtra whose fascination with numbers led to the discovery of one of mathematics' most intriguing constants: 6174.
Known today as Kaprekar's constant, 6174 has a remarkable property. When a simple mathematical process is repeatedly applied to almost any four-digit number whose digits are not all identical, the calculation eventually reaches 6174. Once it arrives there, the same process produces 6174 again and again.
