4444 = 22 x 11 x 101.
4444 is a number that cannot be written as a sum of three squares.
121 × (1 + 2 + 1) = 484 = 222
12,321 × (1 + 2 + 3 + 2 + 1) = 110,889 = 3332
12,34,321 × (1 + 2 + 3 + 4 + 3 + 2 + 1) = 19,749,136 = 4,4442
4444 is 32324 in base 6 and 15646 in base 7.
Source: Numeropedia
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