1723
Port 1723 carries PPTP, an early and now-broken VPN protocol.
- Odd
- Prime
Where 1723 fits
Why 1723 is special
PPTP is included as a warning rather than a recommendation: its authentication was reduced to a single DES key strength in 2012 and can be broken in hours regardless of password. It is still offered by consumer routers, which is the reason worth knowing about it.
1723 connects to:
- historical years — appears in
- 1194 — contrasts with
Same number, different meanings
How 1723 is understood across different contexts — never implying one meaning because of another.
- Mathematics
PPTP is included as a warning rather than a recommendation: its authentication was reduced to a single DES key strength in 2012 and can be broken in hours regardless of password. It is still offered by consumer routers, which is the reason worth knowing about it.
- History
In 1723, Adam Smith was born in Kirkcaldy; Bach completed his first year as cantor at Leipzig (Europe).
- Technology & computing
PPTP's authentication was reduced to single-DES strength by a public demonstration in 2012, meaning any captured session can be broken in hours regardless of password quality. It remains available on consumer routers, which is the reason it is worth knowing rather than a reason to use it.
1723 is part of
Factors & digit properties
- Divisors (2)
- 1, 1723
- Prime factorisation
- 1723
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 1723
- Scientific notation
- 1.723 × 10^3
Roman numerals
M D C C X X I I I
Binary
1 1 0 1 0 1 1 1 0 1 1
1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,723
Octal
3 2 7 3
3 × 512 + 2 × 64 + 7 × 8 + 3 × 1 = 1,723
Hexadecimal
6 b b
6 × 256 + b × 16 + b × 1 = 1,723
Read as powers of two: 1,024 + 512 + 128 + 32 + 16 + 8 + 2 + 1 = 1,723.
In historical numeral systems
Egyptian
1 lotus, 7 coils of rope, 2 hobbles, 3 strokes
1 × 1,000 + 7 × 100 + 2 × 10 + 3 × 1 = 1,723. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 8 vertical wedges (sixties place), 4 corner wedges + 3 vertical wedges (units place)
28 × 60 + 43 = 1723. 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
- Lucky number (mathematical sieve)
- Twin prime
Related numbers & connections
1723 is a year in the 18th century, in the 1720s.
PPTP and OpenVPN are two generations of VPN. PPTP's authentication was broken publicly in 2012 and it persists on consumer routers; OpenVPN is frequently moved to port 443 to avoid being blocked.
View 1194 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with1194
why?
Strength 0.50, confidence "high".
History
In 1723, Adam Smith was born in Kirkcaldy; Bach completed his first year as cantor at Leipzig (Europe).
DocumentedHistoryGeography: EuropePeriod: 1723
Technology & computing
PPTP's authentication was reduced to single-DES strength by a public demonstration in 2012, meaning any captured session can be broken in hours regardless of password quality. It remains available on consumer routers, which is the reason it is worth knowing rather than a reason to use it.
DocumentedTechnology & computing
Common questions
Is 1723 a prime number?
Yes, 1723 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1723?
The factors of 1723 are 1, 1723.
What is 1723 in Roman numerals?
1723 in Roman numerals is MDCCXXIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026