Work out armstrong number checker instantly with clear inputs, formula shown and shareable results.
An Armstrong (narcissistic) number equals the sum of its own digits each raised to the power of the number of digits. For three-digit numbers that means the sum of the cubes of the digits.
Armstrong condition
v = Σ dᵏ where d are the digits of v and k is how many there are
Yes: 1³ + 5³ + 3³ = 1 + 125 + 27 = 153.
Fourteen if you count the single digits 1 to 9, plus 153, 370, 371 and 407.