1242
1242 is a year in the 13th century. Alexander Nevsky defeated the Teutonic Order on the frozen Lake Peipus (Eastern Europe).
- Even
- Composite
Where 1242 fits
Why 1242 is special
1242 has a profile because of what happened in it rather than because of any property of the number: Alexander Nevsky defeated the Teutonic Order on the frozen Lake Peipus (Eastern Europe).
1242 is part of
Factors & digit properties
- Divisors (16)
- 1, 2, 3, 6, 9, 18, 23, 27, 46, 54, 69, 138, 207, 414, 621, 1242
- Prime factorisation
- 2 × 3^3 × 23
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 1242
- Scientific notation
- 1.242 × 10^3
Roman numerals
M C C X L I I
MCCXLII uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 1 1 0 1 1 0 1 0
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,242
Octal
2 3 3 2
2 × 512 + 3 × 64 + 3 × 8 + 2 × 1 = 1,242
Hexadecimal
4 d a
4 × 256 + d × 16 + a × 1 = 1,242
Read as powers of two: 1,024 + 128 + 64 + 16 + 8 + 2 = 1,242.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 4 hobbles, 2 strokes
1 × 1,000 + 2 × 100 + 4 × 10 + 2 × 1 = 1,242. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges (sixties place), 4 corner wedges + 2 vertical wedges (units place)
20 × 60 + 42 = 1242. 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
- Abundant number
- Harshad (Niven) number
Related numbers & connections
1242 is a year in the 13th century, in the 1240s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1242, Alexander Nevsky defeated the Teutonic Order on the frozen Lake Peipus (Eastern Europe).
DocumentedHistoryGeography: Eastern EuropePeriod: 1242
Common questions
Is 1242 a prime number?
No, 1242 is not prime.
What are the factors of 1242?
The factors of 1242 are 1, 2, 3, 6, 9, 18, 23, 27, 46, 54, 69, 138, 207, 414, 621, 1242.
What is 1242 in Roman numerals?
1242 in Roman numerals is MCCXLII. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MCCXXXXII, 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