1,111,111,101
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100000 x 123456789 = 12345678900000
1.524157875019052e+16
3 and 9. And they divide into 123456789 whether or not you use divisibility rules!
123456789 + 123456789 = 246913578
A number divisible by 123456789 must be 0 or bigger than 123456789. It must, therefore have 1 digit or 9 digits (or more). A remainder of 1 makes no difference to the number of digits. In any case, there can be no number of 4 digits that is divisible by 123456789.