2,004
2,004 is a composite number, even, a calendar year.
Notable events — 2004 AD
- Jan 4 NASA's Spirit rover lands on Mars.
- Mar 11 Al-Qaeda-linked bombings on Madrid commuter trains kill 192.
- Apr 1 Google launches Gmail.
- May 1 Ten nations join the European Union in its largest-ever expansion.
- Dec 26 A magnitude 9.1 earthquake off Sumatra triggers an Indian Ocean tsunami killing over 230,000.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 2004
- Ended on
-
Friday
December 31, 2004
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 11
Sunday, April 11, 2004
- Decade
-
2000s
2000–2009
- Century
-
21st century
2001–2100
- Millennium
-
3rd millennium
2001–3000
- Years ago
-
22
22 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
- Summer Olympics
- Yes
In other calendars
- Hebrew
-
5764 / 5765 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1424 / 1425 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Monkey
Sexagenary cycle position 21 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2547 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1382 / 1383 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1996 / 1997 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1926 / 1925 Saka
Indian national calendar; year starts in March.
- Japanese
-
Heisei 16
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 6
- Digit product
- 0
- Digital root
- 6
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 4,002
- Recamán's sequence
- a(3,743) = 2,004
- Square (n²)
- 4,016,016
- Cube (n³)
- 8,048,096,064
- Divisor count
- 12
- σ(n) — sum of divisors
- 4,704
- φ(n) — Euler's totient
- 664
- Sum of prime factors
- 174
Primality
Prime factorization: 2 2 × 3 × 167
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- two thousand four
- Ordinal
- 2004th
- Roman numeral
- MMIV
- Binary
- 11111010100
- Octal
- 3724
- Hexadecimal
- 0x7D4
- Base64
- B9Q=
- One's complement
- 63,531 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵βδʹ
- Mayan (base 20)
- 𝋥·𝋠·𝋤
- Chinese
- 二千零四
- Chinese (financial)
- 貳仟零肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 2,004 = 6
- e — Euler's number (e)
- Digit 2,004 = 9
- φ — Golden ratio (φ)
- Digit 2,004 = 6
- √2 — Pythagoras's (√2)
- Digit 2,004 = 4
- ln 2 — Natural log of 2
- Digit 2,004 = 4
- γ — Euler-Mascheroni (γ)
- Digit 2,004 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 2004, here are decompositions:
- 5 + 1999 = 2004
- 7 + 1997 = 2004
- 11 + 1993 = 2004
- 17 + 1987 = 2004
- 31 + 1973 = 2004
- 53 + 1951 = 2004
- 71 + 1933 = 2004
- 73 + 1931 = 2004
Showing the first eight; more decompositions exist.
UTF-8 encoding: DF 94 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.212.
- Address
- 0.0.7.212
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.212
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 2004 first appears in π at position 7,235 of the decimal expansion (the 7,235ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.