793
793 is the year of the Viking raid on Lindisfarne.
- Odd
- Composite
Where 793 fits
Why 793 is special
It is the conventional start of the Viking Age. The raid on an undefended monastery shocked contemporaries precisely because monasteries had been considered safe.
Same number, different meanings
How 793 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It is the conventional start of the Viking Age. The raid on an undefended monastery shocked contemporaries precisely because monasteries had been considered safe.
- History
The Lindisfarne raid of 793 is treated as the Viking Age's opening because of the reaction it provoked: an attack on an unarmed religious house was outside the expectations of the time.
- Technology & computing
TCP promises ordered, complete delivery, which is what almost every application wants. The cost is that a single lost packet blocks everything behind it, and escaping that required abandoning TCP entirely.
793 is part of
Factors & digit properties
- Divisors (4)
- 1, 13, 61, 793
- Prime factorisation
- 13 × 61
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 793
- Scientific notation
- 7.930 × 10^2
Roman numerals
D C C X C I I I
DCCXCIII uses the subtractive pair XC: ten before a hundred — a hundred minus ten.
Binary
1 1 0 0 0 1 1 0 0 1
1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 793
Octal
1 4 3 1
1 × 512 + 4 × 64 + 3 × 8 + 1 × 1 = 793
Hexadecimal
3 1 9
3 × 256 + 1 × 16 + 9 × 1 = 793
Read as powers of two: 512 + 256 + 16 + 8 + 1 = 793.
In historical numeral systems
Egyptian
7 coils of rope, 9 hobbles, 3 strokes
7 × 100 + 9 × 10 + 3 × 1 = 793. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 3 vertical wedges (sixties place), 1 corner wedge + 3 vertical wedges (units place)
13 × 60 + 13 = 793. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
psi, then koppa, then gamma, marked as a numeral
psi-koppa-gamma + keraia
psi + koppa + gamma 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 shin, then tsadi, then gimel
tav-shin-tsadi-gimel
tav (400) + shin (300) + tsadi (90) + gimel (3) = 793, 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
- Happy number
- Semiprime
Related numbers & connections
RFC 793 labels the TCP specification. The protocol has been revised repeatedly and the number is still how the original is referenced.
The Lindisfarne raid of 793 opens the Viking Age and Cnut ruled England from 1016. Two and a half centuries separate the first shock from Danish kingship.
View 1016 →Numbers Around Us
- appears inNumbers assigned as identifiers
why?
Strength 0.50, confidence "high".
Other connections
- is associated with1016
why?
Strength 0.50, confidence "high".
- developed from791
why?
Strength 0.50, confidence "high".
- contrasts with4960
why?
Strength 0.50, confidence "high".
- developed from5681
why?
Strength 0.50, confidence "high".
- contrasts with768
why?
Strength 0.50, confidence "high".
- is associated with7323
why?
Strength 0.50, confidence "high".
- is associated with8684
why?
Strength 0.50, confidence "high".
History
The Lindisfarne raid of 793 is treated as the Viking Age's opening because of the reaction it provoked: an attack on an unarmed religious house was outside the expectations of the time.
DocumentedHistoryGeography: EnglandPeriod: 793
Technology & computing
TCP promises ordered, complete delivery, which is what almost every application wants. The cost is that a single lost packet blocks everything behind it, and escaping that required abandoning TCP entirely.
DocumentedTechnology & computingPeriod: 1981
Common questions
Is 793 a prime number?
No, 793 is not prime.
What are the factors of 793?
The factors of 793 are 1, 13, 61, 793.
What is 793 in Roman numerals?
793 in Roman numerals is DCCXCIII. XC is subtractive: ten before a hundred — a hundred minus ten. Written additively it would be DCCLXXXXIII, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026