ISBN 9639609198 hat failed the check­sum digit test.
The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 9639609198 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: English language
ISBNas­su­med er­rorCatalogs for checking
0-6396-0919-8first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
90-396-6919-82nd and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Greece
ISBNas­su­med er­rorCatalogs for checking
960-9609-19-8third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Hungary
ISBNas­su­med er­rorCatalogs for checking
963-460-919-8fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9209-19-8fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9603-19-8seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9609-18-8ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9609-19-6tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9609-49-8eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9649-19-8sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-9690-19-86th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Romania
ISBNas­su­med er­rorCatalogs for checking
973-96091-9-8second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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