Credit Card Account Number

Credit Card Account Number. If you don't have your credit card, you can find your account number on a paper bill or by logging into your account online. The account number is personal to the owner and this information is necessary when making online purchases where the cardholder is not present.

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Your account number can only be found on your physical Card. The credit card account number will be made up of a certain amount of digits which will be displayed on the front of the card with a security number on the rear face of the card. They contain four specific pieces of information--the type of card, the issuer of the card, the account number and a security checksum digit.

The account number is personal to the owner and this information is necessary when making online purchases where the cardholder is not present.

The final digit on your credit card is known as the "check digit" or "checksum." This number is set by something called the Luhn formula, patented by Hans Peter Luhn, an IBM scientist.

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The first digit on a credit card is like an area code in a phone number. An account number is a unique number assigned by a financial institution to a credit card customer. Mountain America issues randomized card numbers in order to better protect members from fraud.