3999
This number is a composite.
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The smallest number whose sum of digits is sphenic
number. Interestingly, 3999 is also a sphenic
number, i.e., 3999 = 3 x 31 x 43. [Gudipati]
Submitted: 2026-05-19 15:21:07; Last Modified: 2026-05-19 15:56:11.
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