There is a six-digit number whose unit digit is 6. If 6 is moved to the first place and the order of the rest of the digits remains unchanged, the new six-digit number is four times the original number. What is the original six-digit number?
有一个六位数，它的个位数字是6，如果将6移至第一位，其余数字顺序不变，所得新六位数是原数的4倍，原六位数是多少？
<result>153_846</result>