A four-digit number, the ones digit is the smallest prime number, the tens digit is the smallest composite number, the number in the hundreds digit is both an odd number and a composite number, and the number in the thousands digit is twice the number in the tens digit. how many?
一个四位数，个位上是最小的质数，十位上是最小的合数，百位上的数既是奇数又是合数，千位上的数是十位上数字的2倍，这个数是多少？
<result>8_942</result>