All digits of a three-digit number are not 0, and the ratio of this three-digit number to the product of its digits is M. (For example, the three-digit number is 432, M=432/(4*3*2)=18). Then, what is the maximum value of M?
一个三位数的各位数字都不是0，这个三位数与组成它的各位数字之积的比是M．(如三位数432，M=432/(4*3*2)=18)．那么，M的最大值是多少．
<gadget id="calculator">1 * 1 * 1</gadget>
<output>1</output>

<gadget id="calculator">111 / 1</gadget>
<output>111</output>

<result>111</result>