September = 9932
First Digit: 9 letter in the spelling of September
Second Digit: September is the ninth month
Third Digit: Number of Vowels in the spelling of September i.e. 3
last digit is square root of there sum of there ranks of alphabets
eg
may: M=13, A=1, Y=25, sum is 49, 4+9=13, 1+3=4: sq root of 4 is 2..
Similarly:
S=19 e=5 p=16 t=20 e=5 m=13 b=2 e=5 r=18
=> total =103=4,
=> sq root of 4 is 2,
=> so overall 9932