423
HTTP 423 Locked means the resource is locked against the requested change.
- Odd
- Composite
Where 423 fits
Why 423 is special
423 comes from WebDAV, where a client can take an explicit lock on a document before editing it. It is the check-out model applied to HTTP: the second editor is refused outright rather than allowed to start work that will later conflict.
Not just a mathematical number
423is also used in ways where ordinary arithmetic doesn't apply — each listed below with what genuinely does and doesn't follow from it.
- Mathematical number
A genuine quantity — its mathematical properties (prime, square, factors, and so on) are real facts about it.
A genuine quantity that ordinary arithmetic applies to — it can be prime, even, a perfect square, added to another number meaningfully, and so on.
- Code
Also used as a code — HTTP status codes.
An assigned identifier from a fixed registry or standard — its digits don't represent an amount, and arithmetic on it is meaningless (HTTP status 404 + 1 is not a 'better' status; it's a different, unrelated code).
Factors & digit properties
- Divisors (6)
- 1, 3, 9, 47, 141, 423
- Prime factorisation
- 3^2 × 47
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 423
- Binary
- 110100111
- Octal
- 647
- Hexadecimal
- 1a7
- Roman numeral
- CDXXIII
- Scientific notation
- 4.230 × 10^2
Other mathematical patterns
- Deficient number
- Harshad (Niven) number
Related numbers & connections
423 refuses a change because the resource is explicitly locked, a WebDAV mechanism that applies a check-out model to HTTP.
Numbers Around Us
- appears inHTTP status codes
why?
Strength 0.50, confidence "high".
Technology & computing
423 comes from WebDAV, where a client can lock a document before editing it. It applies the check-out model to HTTP: rather than letting two people edit and resolving the conflict afterwards, the second is refused at the point of asking.
DocumentedTechnology & computing
Common questions
Is 423 a prime number?
No, 423 is not prime.
What are the factors of 423?
The factors of 423 are 1, 3, 9, 47, 141, 423.
What is 423 in Roman numerals?
423 in Roman numerals is CDXXIII.
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