854
RFC 854 defines the Telnet protocol.
- Even
- Composite
Where 854 fits
Why 854 is special
It sent everything, including passwords, in clear text, and remained the normal way to log into a remote machine for two decades before SSH replaced it.
Factors & digit properties
- Divisors (8)
- 1, 2, 7, 14, 61, 122, 427, 854
- Prime factorisation
- 2 × 7 × 61
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 854
- Scientific notation
- 8.540 × 10^2
Roman numerals
D C C C L I V
DCCCLIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 1 0 1 0 1 0 1 1 0
1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 854
Octal
1 5 2 6
1 × 512 + 5 × 64 + 2 × 8 + 6 × 1 = 854
Hexadecimal
3 5 6
3 × 256 + 5 × 16 + 6 × 1 = 854
Read as powers of two: 512 + 256 + 64 + 16 + 4 + 2 = 854.
In historical numeral systems
Egyptian
8 coils of rope, 5 hobbles, 4 strokes
8 × 100 + 5 × 10 + 4 × 1 = 854. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 4 vertical wedges (sixties place), 1 corner wedge + 4 vertical wedges (units place)
14 × 60 + 14 = 854. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
omega, then nu, then delta, marked as a numeral
omega-nu-delta + keraia
omega + nu + delta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then tav, then nun, then dalet
tav-tav-nun-dalet
tav (400) + tav (400) + nun (50) + dalet (4) = 854, written in descending order.
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
Related numbers & connections
Telnet sends credentials in clear text and SSH does not, which is the whole reason the second replaced the first.
View 22 →Other connections
- contrasts with22
why?
Strength 0.50, confidence "high".
Technology & computing
RFC 854 specifies a bidirectional character-oriented terminal protocol with no confidentiality or integrity protection; it is now used mainly as a diagnostic tool for probing other services.
DocumentedTechnology & computingGeography: International — IETFPeriod: 1983
Common questions
Is 854 a prime number?
No, 854 is not prime.
What are the factors of 854?
The factors of 854 are 1, 2, 7, 14, 61, 122, 427, 854.
What is 854 in Roman numerals?
854 in Roman numerals is DCCCLIV. IV is subtractive: one before five — five minus one. Written additively it would be DCCCLIIII, 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