143
Port 143 carries IMAP, the protocol for reading mail kept on a server.
- Odd
- Composite
Where 143 fits
Why 143 is special
IMAP's difference from POP3 is that the mail stays on the server, so the same mailbox looks identical from a phone and a laptop. That design is why webmail and multi-device mail feel normal, and why port 143 largely displaced the download-and-delete model.
Factors & digit properties
- Divisors (4)
- 1, 11, 13, 143
- Prime factorisation
- 11 × 13
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 143
- Binary
- 10001111
- Octal
- 217
- Hexadecimal
- 8f
- Roman numeral
- CXLIII
- Scientific notation
- 1.430 × 10^2
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
IMAP leaves mail on the server so every device sees the same mailbox; POP3 downloads and deletes it. The choice between the two ports is the choice between those models.
View 995 →Other connections
- contrasts with995
why?
Strength 0.50, confidence "high".
Technology & computing
IMAP keeps messages on the server rather than downloading and deleting them, so a mailbox read on a phone and a laptop stays in one state. That design is the reason multi-device mail feels unremarkable, and why 143 displaced the older download model.
DocumentedTechnology & computing
Common questions
Is 143 a prime number?
No, 143 is not prime.
What are the factors of 143?
The factors of 143 are 1, 11, 13, 143.
What is 143 in Roman numerals?
143 in Roman numerals is CXLIII.
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