In a five-digit number, each digit is different and the value is not 0, and the number composed of the last three digits is seven times that of the first three digits. So, what is this five-digit number?
在一个五位数中，每位数各不相同且值不为0，后三位数字组成的数是前三位数字组成的数的七倍．那么，这个五位数是多少．
<result>12_896</result>