389
Port 389 carries LDAP, the directory protocol behind most corporate logins.
- Odd
- Prime
Where 389 fits
Why 389 is special
When a work laptop accepts a password, an LDAP directory is usually what confirmed it. Port 389 is the unencrypted form and 636 the TLS one, which is why directory traffic on 389 inside a corporate network is a long-standing audit finding.
389 is part of
Factors & digit properties
- Divisors (2)
- 1, 389
- Prime factorisation
- 389
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 389
- Binary
- 110000101
- Octal
- 605
- Hexadecimal
- 185
- Roman numeral
- CCCLXXXIX
- Scientific notation
- 3.890 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
LDAP runs on port 389 in the clear and 636 under TLS, a split that predates the assumption that directory queries should be encrypted.
View 4511 →Technology & computing
LDAP directories are what most corporate logins are verified against. Port 389 carries it unencrypted and 636 carries it over TLS, which is why directory traffic on 389 remains a standing audit finding even on internal networks.
DocumentedTechnology & computing
Common questions
Is 389 a prime number?
Yes, 389 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 389?
The factors of 389 are 1, 389.
What is 389 in Roman numerals?
389 in Roman numerals is CCCLXXXIX.
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