A six-digit number, its unit is 6. If this 6 is moved to the highest digit of the original number, and the digits on the other digits are moved backwards one by one, the resulting six digits will be four times the original number. What was the original six-digit number?
一个六位数，它的个位上是6．如果把这个6移到原数的最高位，其他各位上的数字依次往后移，那么所得的六位数是原来的4倍．原来的六位数是多少？
<result>153_846</result>