18,004
ISO/IEC 18004 is the QR code standard.
- Even
- Composite
Where 18,004 fits
Why 18,004 is special
QR codes were invented in 1994 for tracking car parts and the patent was never enforced, which is much of why they became universal. The error correction is strong enough that a code still scans with up to about 30 percent of it obscured.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 7, 14, 28, 643, 1286, 2572, 4501, 9002, 18004
- Prime factorisation
- 2^2 × 7 × 643
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 18004
- Binary
- 100011001010100
- Octal
- 43124
- Hexadecimal
- 4654
- Scientific notation
- 1.800 × 10^4
Other mathematical patterns
- Abundant number
Related numbers & connections
QR codes and contactless cards both encode data for a reader that supplies its own context — one optically and one by electromagnetic field. Both spread because the specifications were open enough to implement freely.
View 14443 →Other connections
- is associated with14443
why?
Strength 0.50, confidence "high".
Technology & computing
QR codes spread partly because their inventor chose not to enforce the patent. Their error correction allows up to roughly 30 percent of a code to be damaged or covered while remaining readable, which is why they survive on weathered signs.
DocumentedTechnology & computingPeriod: 1994
Common questions
Is 18,004 a prime number?
No, 18,004 is not prime.
What are the factors of 18,004?
The factors of 18,004 are 1, 2, 4, 7, 14, 28, 643, 1286, 2572, 4501, 9002, 18004.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026