There is a nine-digit abcdefghi whose digits are different and all of them are not 0, and the two-digit ab is divisible by 2, the three-digit abc is divisible by 3, the four-digit abcd is divisible by 4, ..., and so on By analogy, the nine-digit number abcdefghi is divisible by 9. What is this nine-digit abcdefghi?
有一个九位数abcdefghi的各位数字都不相同且全都不为0，并且二位数ab可被2整除，三位数abc可被3整除，四位数abcd可被4整除，…，依此类推，九位数abcdefghi可被9整除．请问这个九位数abcdefghi是什么？
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