A narcissistic number is a special type of number that is equal to the sum of its own digits raised to the power of the number of digits. For example, the number 153 has three digits, and when you calculate 1^3 + 5^3 + 3^3, the result is 153 itself. These numbers are also known as Armstrong numbers or pluperfect digital invariants. They can be found in various numerical bases, but the most common examples are in base 10. Other examples include 370, 371, and 407, which also satisfy the narcissistic condition.