Calculators

Armstrong Number Checker

Test for narcissistic numbers.

Whole number

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Verdict

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Digits

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Digit-power sum

Working

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This free Armstrong number checker tests whether a number is an Armstrong number — also called a narcissistic number. A number is Armstrong if the sum of its digits, each raised to the power of the digit count, equals the number itself. For example 153 = 1³ + 5³ + 3³. The tool shows the full working line so you can follow the math.