There is a nine-digit number, the lowest digit is 2, the first digit is 4, and the sum of any adjacent 3 digits is 15. What is this number?
有一个九位数，最低位数字是2，首位数字是4，任意相邻的3个数字的和是15，．这个数是多少．
<result>492_492_492</result>