four-digit number, the highest digit is the largest single digit, the digit at the tens digit is the smallest prime number, the digit at the ones digit is 3 times the digit at the tens digit, and the digit at the hundreds digit is 2 times larger than the digit at the ones digit , what is this number.
一个四位数，最高位是最大的一位数，十位上的数字是最小的质数，个位上的数字是十位上的3倍，百位上的数字比个位上的数字大2，这个数是多少．
<result>9_826</result>