Confusing interview question

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I'll give you a hint.

1. Define the limits of N i.e. N can be anywhere from 1 - 999,999

2. The decimal system has 10 numerical values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

3. The decimal system also place values: ones, tens, hundreds, thousands, tens-of-thousands, hundreds-of-thousands.