807
CWE-807 is reliance on untrusted inputs in a security decision.
- Odd
- Composite
Where 807 fits
Why 807 is special
Trusting a hidden form field, a cookie value or a Referer header is this weakness, and all three are set entirely by the client.
Factors & digit properties
- Divisors (4)
- 1, 3, 269, 807
- Prime factorisation
- 3 × 269
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 807
- Scientific notation
- 8.070 × 10^2
Roman numerals
D C C C V I I
Binary
1 1 0 0 1 0 0 1 1 1
1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 807
Octal
1 4 4 7
1 × 512 + 4 × 64 + 4 × 8 + 7 × 1 = 807
Hexadecimal
3 2 7
3 × 256 + 2 × 16 + 7 × 1 = 807
Read as powers of two: 512 + 256 + 32 + 4 + 2 + 1 = 807.
In historical numeral systems
Egyptian
8 coils of rope, 7 strokes
8 × 100 + 7 × 1 = 807. 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), 2 corner wedges + 7 vertical wedges (units place)
13 × 60 + 27 = 807. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
omega, then zeta, marked as a numeral
omega-zeta + keraia
omega + zeta 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 zayin
tav-tav-zayin
tav (400) + tav (400) + zayin (7) = 807, 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
- Semiprime
Related numbers & connections
Trusting client-controlled input and enforcing rules in the client are the same mistake seen from two directions.
View 602 →Other connections
- is associated with602
why?
Strength 0.50, confidence "high".
Technology & computing
CWE-807 covers security decisions based on inputs the client controls, including hidden fields, cookies and request headers that can be modified freely.
DocumentedTechnology & computingGeography: International — MITRE CWEPeriod: 2006–
Common questions
Is 807 a prime number?
No, 807 is not prime.
What are the factors of 807?
The factors of 807 are 1, 3, 269, 807.
What is 807 in Roman numerals?
807 in Roman numerals is DCCCVII.
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