3389
Port 3389 carries RDP, the Remote Desktop Protocol for controlling a Windows machine remotely.
- Odd
- Prime
Where 3389 fits
Why 3389 is special
3389 is the port most associated with ransomware entry. Exposing a desktop directly to the internet gives an attacker a login prompt to guess against, and public advisories have repeatedly named exposed RDP as a leading initial-access route.
3389 is part of
Factors & digit properties
- Divisors (2)
- 1, 3389
- Prime factorisation
- 3389
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 3389
- Scientific notation
- 3.389 × 10^3
Roman numerals
M M M C C C L X X X I X
MMMCCCLXXXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 0 1 0 0 1 1 1 1 0 1
1 × 2,048 + 1 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 3,389
Octal
6 4 7 5
6 × 512 + 4 × 64 + 7 × 8 + 5 × 1 = 3,389
Hexadecimal
d 3 d
d × 256 + 3 × 16 + d × 1 = 3,389
Read as powers of two: 2,048 + 1,024 + 256 + 32 + 16 + 8 + 4 + 1 = 3,389.
In historical numeral systems
Egyptian
3 lotuses, 3 coils of rope, 8 hobbles, 9 strokes
3 × 1,000 + 3 × 100 + 8 × 10 + 9 × 1 = 3,389. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
5 corner wedges + 6 vertical wedges (sixties place), 2 corner wedges + 9 vertical wedges (units place)
56 × 60 + 29 = 3389. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Sophie Germain prime
- Twin prime
Related numbers & connections
Both give remote control of a machine — RDP a Windows desktop, SSH a shell. Exposing either directly to the internet presents an attacker with a login prompt, which is why both usually sit behind a VPN.
View 22 →VNC and RDP both provide remote control of a desktop. VNC sends the screen image and works anywhere; RDP sends drawing commands and is faster but tied to Windows.
View 5900 →Technology & computing
Exposing Remote Desktop directly to the internet presents an attacker with a login prompt to guess against, and public incident reporting has repeatedly identified exposed RDP as a leading initial-access route for ransomware. Putting it behind a VPN is the standard remedy.
DocumentedTechnology & computing
Common questions
Is 3389 a prime number?
Yes, 3389 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 3389?
The factors of 3389 are 1, 3389.
What is 3389 in Roman numerals?
3389 in Roman numerals is MMMCCCLXXXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MMMCCCLXXXVIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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: 15 July 2026