The admission ticket number of a classmate participating in the mathematics competition is a four-digit number. It is known that the ones digit is three times the tens digit, and the tens digit is three times the hundreds digit, and the sum of the four digits is 16. What is the admission ticket number of this student?
参加数学竞赛的某同学的准考证号是一个四位数．已知个位数字是十位数字的3倍，十位数字是百位数字的3倍，并且这个四位数各个数字的和是16，这个同学的准考证号是多少？
<result>3_139</result>