ISBN 830401909 was input with 9 digits (one digit too few).
The ISBN 830401909 that you entered has got 9 digits, i.e. one digit is missing to make a valid ISBN. You can find information on the format of an ISBN on the home page of this site. This site has found the following 10 numerically correct ISBN out of which the ISBN that you input coule have resulted by a single error (dropping one digit). You can now check out these suggestions in the databases of the following booksellers' sites: amazon.co.uk (UK), amazon.com (USA) and amazon.de (Germany). Additional sites to search by ISBN (in this case, in catalogs of libraries) are e.g. the Library of Congress (USA) or the search gateway of the Deutsche Bibliothek. To the home page
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ISBN prefix group: [no known group prefix]
ISBNas­su­med er­rorCatalogs for checking
6830401909first digit was drop­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Poland
ISBNas­su­med er­rorCatalogs for checking
83-04-01090-9seven­th digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-04-01901-9ninth digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-04-01909-4tenth digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-04-01980-9eighth digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-04-09190-9sixth digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-04-20190-9fifth digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-07-40190-9fourth digit was drop­ped. amazon.co.uk amazon.com amazon.de
83-204-0190-9third digit was drop­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Denmark*
ISBNas­su­med er­rorCatalogs for checking
8730401909second digit was drop­ped. amazon.co.uk amazon.com amazon.de

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