Source: wikibot/narcissistic-number
= Narcissistic number
{wiki=Narcissistic_number}
A Narcissistic number, also known as a pluperfect digital invariant (PDI), is a number that is equal to the sum of its own digits each raised to the power of the number of digits. In simpler terms, for a number \\( n \\), it can be expressed as: \\\[ n = d_1^p + d_2^p + d_3^p + ... + d_k^p \\\] where \\( d_1, d_2, ...