Number
2,005
2,005 is a composite number, odd, a calendar year.
Notable events — 2005 AD
- Feb 14 YouTube is founded.
- Feb 16 The Kyoto Protocol on greenhouse-gas emissions takes effect.
- Apr 2 Pope John Paul II dies; Benedict XVI is elected to succeed him.
- Jul 7 Coordinated suicide bombings on the London transport network kill 52.
- Aug 29 Hurricane Katrina makes landfall, devastating New Orleans and the US Gulf Coast.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
- 52
- Started on
-
Saturday
January 1, 2005
- Ended on
-
Saturday
December 31, 2005
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
March 27
Sunday, March 27, 2005
- Decade
-
2000s
2000–2009
- Century
-
21st century
2001–2100
- Millennium
-
3rd millennium
2001–3000
- Years ago
-
21
21 years before 2026.
In other calendars
- Hebrew
-
5765 / 5766 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1425 / 1426 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2548 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1383 / 1384 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1997 / 1998 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1927 / 1926 Saka
Indian national calendar; year starts in March.
- Japanese
-
Heisei 17
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 7
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,002
- Recamán's sequence
- a(3,741) = 2,005
- Square (n²)
- 4,020,025
- Cube (n³)
- 8,060,150,125
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,412
- φ(n) — Euler's totient
- 1,600
- Sum of prime factors
- 406
Primality
Prime factorization: 5 × 401
Divisors & multiples
Aliquot sum (sum of proper divisors):
407
First multiples
Sums & aliquot sequence
As a sum of two squares:
18² + 41² = 22² + 39²
As consecutive integers:
1,002 + 1,003
399 + 400 + 401 + 402 + 403
196 + 197 + … + 205
Aliquot sequence:
2,005 → 407 → 49 → 8 → 7 → 1 → 0
— terminates at zero
Representations
- In words
- two thousand five
- Ordinal
- 2005th
- Roman numeral
- MMV
- Binary
- 11111010101
- Octal
- 3725
- Hexadecimal
- 0x7D5
- Base64
- B9U=
- One's complement
- 63,530 (16-bit)
In other bases
ternary (3)
2202021
quaternary (4)
133111
quinary (5)
31010
senary (6)
13141
septenary (7)
5563
nonary (9)
2667
undecimal (11)
1563
duodecimal (12)
11b1
tridecimal (13)
bb3
tetradecimal (14)
a33
pentadecimal (15)
8da
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵βεʹ
- Mayan (base 20)
- 𝋥·𝋠·𝋥
- Chinese
- 二千零五
- Chinese (financial)
- 貳仟零伍
In other modern scripts
Eastern Arabic
٢٠٠٥
Devanagari
२००५
Bengali
২০০৫
Tamil
௨௦௦௫
Thai
๒๐๐๕
Tibetan
༢༠༠༥
Khmer
២០០៥
Lao
໒໐໐໕
Burmese
၂၀၀၅
Digit at this position in famous constants
- π — Pi (π)
- Digit 2,005 = 5
- e — Euler's number (e)
- Digit 2,005 = 9
- φ — Golden ratio (φ)
- Digit 2,005 = 0
- √2 — Pythagoras's (√2)
- Digit 2,005 = 4
- ln 2 — Natural log of 2
- Digit 2,005 = 7
- γ — Euler-Mascheroni (γ)
- Digit 2,005 = 4
Also seen as
Unicode codepoint
ߕ
Nko Letter Ta
U+07D5
Other letter (Lo)
UTF-8 encoding: DF 95 (2 bytes).
Hex color
#0007D5
RGB(0, 7, 213)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.213.
- Address
- 0.0.7.213
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.213
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 2005 first appears in π at position 33,382 of the decimal expansion (the 33,382ordinal-suffix:nd 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.