639489-84-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 639489-84-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,9,4,8 and 9 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 639489-84:
(8*6)+(7*3)+(6*9)+(5*4)+(4*8)+(3*9)+(2*8)+(1*4)=222
222 % 10 = 2
So 639489-84-2 is a valid CAS Registry Number.