Numberwise

9798

ISO/IEC 9798 specifies entity authentication mechanisms.

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Where 9798 fits

Where 9798 fits: Related numbersRelated numbers: 287.Related numbers2879798
9798 connects to 1 world: related numbers.

Why 9798 is special

Several of its early mechanisms were found vulnerable to reflection and interleaving attacks and had to be corrected, which is unusual for a published standard.

Factors & digit properties

Divisors (16)
1, 2, 3, 6, 23, 46, 69, 71, 138, 142, 213, 426, 1633, 3266, 4899, 9798
Prime factorisation
2 × 3 × 23 × 71
Digit sum
33
Digital root
6

Representations

Decimal
9798
Scientific notation
9.798 × 10^3

Roman numerals

Roman numerals as modelled here goes up to 3,999.

Binary

1 0 0 1 1 0 0 1 0 0 0 1 1 0

1 × 8,192 + 0 × 4,096 + 0 × 2,048 + 1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 9,798

Octal

2 3 1 0 6

2 × 4,096 + 3 × 512 + 1 × 64 + 0 × 8 + 6 × 1 = 9,798

Hexadecimal

2 6 4 6

2 × 4,096 + 6 × 256 + 4 × 16 + 6 × 1 = 9,798

Read as powers of two: 8,192 + 1,024 + 512 + 64 + 4 + 2 = 9,798.

In historical numeral systems

Egyptian

9 lotuses, 7 coils of rope, 9 hobbles, 8 strokes

9 × 1,000 + 7 × 100 + 9 × 10 + 8 × 1 = 9,798. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.

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

  • Abundant number

Related numbers & connections

Connection
Entity authentication mechanisms are the standardised answer to the weakness class of improper authentication.

Entity authentication mechanisms are the standardised answer to the weakness class of improper authentication.

View 287 →

Other connections

  • is associated with287
    why?

    Strength 0.50, confidence "high".

How is 9798 connected to another number? →

Technology & computing

  • ISO/IEC 9798 specifies entity authentication mechanisms. Formal analysis identified weaknesses in several published mechanisms, leading to corrections in later revisions.

    DocumentedTechnology & computingGeography: International — ISO member bodiesPeriod: 1991–

Common questions

Is 9798 a prime number?

No, 9798 is not prime.

What are the factors of 9798?

The factors of 9798 are 1, 2, 3, 6, 23, 46, 69, 71, 138, 142, 213, 426, 1633, 3266, 4899, 9798.

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