Number
1,985
1,985 is a composite number, odd, a calendar year.
Notable events — 1985 AD
- Jan 1 The Internet's Domain Name System (DNS) is created.
- Mar 11 Mikhail Gorbachev becomes leader of the Soviet Union.
- May 16 British Antarctic Survey scientists announce the discovery of the ozone hole.
- Jul 13 Live Aid concerts in London and Philadelphia raise funds for Ethiopian famine relief.
- Sep 1 A US-French expedition discovers the wreck of the RMS Titanic.
- Sep 19 A magnitude 8.0 earthquake devastates Mexico City.
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
-
Tuesday
January 1, 1985
- Ended on
-
Tuesday
December 31, 1985
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 7
Sunday, April 7, 1985
- Decade
-
1980s
1980–1989
- Century
-
20th century
1901–2000
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
41
41 years before 2026.
In other calendars
- Hebrew
-
5745 / 5746 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1405 / 1406 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Ox
Sexagenary cycle position 2 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2528 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1363 / 1364 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1977 / 1978 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1907 / 1906 Saka
Indian national calendar; year starts in March.
- Japanese
-
Shōwa 60
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 23
- Digit product
- 360
- Digital root
- 5
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,891
- Recamán's sequence
- a(3,781) = 1,985
- Square (n²)
- 3,940,225
- Cube (n³)
- 7,821,346,625
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,388
- φ(n) — Euler's totient
- 1,584
- Sum of prime factors
- 402
Primality
Prime factorization: 5 × 397
Divisors & multiples
Aliquot sum (sum of proper divisors):
403
First multiples
Sums & aliquot sequence
As a sum of two squares:
7² + 44² = 31² + 32²
As consecutive integers:
992 + 993
395 + 396 + 397 + 398 + 399
194 + 195 + … + 203
Aliquot sequence:
1,985 → 403 → 45 → 33 → 15 → 9 → 4 → 3 → 1 → 0
— terminates at zero
Representations
- In words
- one thousand nine hundred eighty-five
- Ordinal
- 1985th
- Roman numeral
- MCMLXXXV
- Binary
- 11111000001
- Octal
- 3701
- Hexadecimal
- 0x7C1
- Base64
- B8E=
- One's complement
- 63,550 (16-bit)
In other bases
ternary (3)
2201112
quaternary (4)
133001
quinary (5)
30420
senary (6)
13105
septenary (7)
5534
nonary (9)
2645
undecimal (11)
1545
duodecimal (12)
1195
tridecimal (13)
b99
tetradecimal (14)
a1b
pentadecimal (15)
8c5
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αϡπεʹ
- Mayan (base 20)
- 𝋤·𝋳·𝋥
- Chinese
- 一千九百八十五
- Chinese (financial)
- 壹仟玖佰捌拾伍
In other modern scripts
Eastern Arabic
١٩٨٥
Devanagari
१९८५
Bengali
১৯৮৫
Tamil
௧௯௮௫
Thai
๑๙๘๕
Tibetan
༡༩༨༥
Khmer
១៩៨៥
Lao
໑໙໘໕
Burmese
၁၉၈၅
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,985 = 8
- e — Euler's number (e)
- Digit 1,985 = 4
- φ — Golden ratio (φ)
- Digit 1,985 = 7
- √2 — Pythagoras's (√2)
- Digit 1,985 = 0
- ln 2 — Natural log of 2
- Digit 1,985 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,985 = 1
Also seen as
Unicode codepoint
߁
Nko Digit One
U+07C1
Decimal digit (Nd)
UTF-8 encoding: DF 81 (2 bytes).
Hex color
#0007C1
RGB(0, 7, 193)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.193.
- Address
- 0.0.7.193
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.193
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 1985 first appears in π at position 11,065 of the decimal expansion (the 11,065ordinal-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.