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What is Narcissistic Number?
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Narcissistic Number is a number which is equal to the sum of the cubes of its digits.

example, 153  =  13  +  53  +  33  =  1   +  125 +  27  =  153

Also note that: 153 = 1 + 2 + 3 + 4 + ... + 16 + 17, or 153 is the 17th triangular number.

Also, 153 = 1! + 2! + 3! + 4! + 5!

by engr III (10.4k points)