1, 3 and 9
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The factors of 123456789 are the numbers that can be evenly divided into it without leaving a remainder. The factors of 123456789 are 1, 3, 9, 3607, 10821, and 36073. Prime factors are the factors that are prime numbers. The prime factors of 123456789 are 3, 3607, and 3803.
Nope, its factors are: 1, 3, 9, 3607, 3803, 10821, 11409, 32463, 34227, 13717421, 41152263, 123456789.
Yes, 123456789 is a multiple of 9
It's not entirely clear from the wording of your question what it is you want to know. Seven is a one-digit number. The sum of its digits is 7. Seven has two factors: 1 and 7. That sum is 8.