2004
2004 is the year of the Indian Ocean earthquake and tsunami.
- Even
- Composite
Where 2004 fits
Why 2004 is special
The magnitude 9.1 earthquake off Sumatra produced waves that killed around 230,000 people across fourteen countries, many of them hours after the quake and with no warning system in place. The Indian Ocean warning network exists because of it.
2004 connects to:
- historical years — appears in
- 2011 — contrasts with
Same number, different meanings
How 2004 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The magnitude 9.1 earthquake off Sumatra produced waves that killed around 230,000 people across fourteen countries, many of them hours after the quake and with no warning system in place. The Indian Ocean warning network exists because of it.
- History
In 2004, an Indian Ocean earthquake and tsunami killed more than 200,000 people (Indian Ocean).
- Science
The magnitude 9.1 earthquake off Sumatra in December 2004 produced a tsunami that killed around 230,000 people across fourteen countries. Many died hours after the quake, in places with no warning system and no reason to expect one. The Indian Ocean warning network was built because of it.
2004 is part of
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 12, 167, 334, 501, 668, 1002, 2004
- Prime factorisation
- 2^2 × 3 × 167
- Digit sum
- 6
- Digital root
- 6
Representations
- Decimal
- 2004
- Scientific notation
- 2.004 × 10^3
Roman numerals
M M I V
MMIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 1 1 1 1 0 1 0 1 0 0
1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 2,004
Octal
3 7 2 4
3 × 512 + 7 × 64 + 2 × 8 + 4 × 1 = 2,004
Hexadecimal
7 d 4
7 × 256 + d × 16 + 4 × 1 = 2,004
Read as powers of two: 1,024 + 512 + 256 + 128 + 64 + 16 + 4 = 2,004.
In historical numeral systems
Egyptian
2 lotuses, 4 strokes
2 × 1,000 + 4 × 1 = 2,004. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 3 vertical wedges (sixties place), 2 corner wedges + 4 vertical wedges (units place)
33 × 60 + 24 = 2004. 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
2004 is a year in the 21st century, in the 2000s.
The Indian Ocean tsunami of 2004 struck without a warning system and Japan in 2011 had one. The difference in preparedness is visible in the outcomes at comparable magnitudes.
View 2011 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with2011
why?
Strength 0.50, confidence "high".
History
In 2004, an Indian Ocean earthquake and tsunami killed more than 200,000 people (Indian Ocean).
DocumentedHistoryGeography: Indian OceanPeriod: 2004
Science
The magnitude 9.1 earthquake off Sumatra in December 2004 produced a tsunami that killed around 230,000 people across fourteen countries. Many died hours after the quake, in places with no warning system and no reason to expect one. The Indian Ocean warning network was built because of it.
DocumentedSciencePeriod: 26 December 2004
Common questions
Is 2004 a prime number?
No, 2004 is not prime.
What are the factors of 2004?
The factors of 2004 are 1, 2, 3, 4, 6, 12, 167, 334, 501, 668, 1002, 2004.
What is 2004 in Roman numerals?
2004 in Roman numerals is MMIV. IV is subtractive: one before five — five minus one. Written additively it would be MMIIII, 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