1,973
1,973 is a prime, odd, a calendar year.
1,973 (one thousand nine hundred seventy-three) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is MCMLXXIII and in binary, 11110110101.
Interestingness
Notable events — 1973 AD
- Jan 22 The US Supreme Court rules in Roe v. Wade, recognizing a constitutional right to abortion.
- Jan 27 The Paris Peace Accords end direct US involvement in the Vietnam War.
- Sep 11 A Chilean coup overthrows President Allende; Augusto Pinochet takes power.
- Oct 6 Egypt and Syria attack Israel on Yom Kippur, beginning the Yom Kippur War.
- Oct 17 OPEC's oil embargo triggers a global energy crisis.
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
-
Monday
January 1, 1973
- Ended on
-
Monday
December 31, 1973
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 22
Sunday, April 22, 1973
- Decade
-
1970s
1970–1979
- Century
-
20th century
1901–2000
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
53
53 years before 2026.
In other calendars
- Hebrew
-
5733 / 5734 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1392 / 1393 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Ox
Sexagenary cycle position 50 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2516 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1351 / 1352 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1965 / 1966 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1895 / 1894 Saka
Indian national calendar; year starts in March.
- Japanese
-
Shōwa 48
Reign-era counting from the start of each emperor's reign.
Properties
Primality
1,973 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,973 = [44; (2, 2, 1, 1, 3, 3, 1, 1, 2, 2, 88)]
Period length 11 — the block in parentheses repeats forever.
Representations
- In words
- one thousand nine hundred seventy-three
- Ordinal
- 1973rd
- Roman numeral
- MCMLXXIII
- Binary
- 11110110101
- Octal
- 3665
- Hexadecimal
- 0x7B5
- Base64
- B7U=
- One's complement
- 63,562 (16-bit)
- Scientific notation
- 1.973 × 10³
- As a duration
- 1,973 s = 32 minutes, 53 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵αϡογʹ
- Mayan (base 20)
- 𝋤·𝋲·𝋭
- Chinese
- 一千九百七十三
- Chinese (financial)
- 壹仟玖佰柒拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,973 = 8
- e — Euler's number (e)
- Digit 1,973 = 5
- φ — Golden ratio (φ)
- Digit 1,973 = 3
- √2 — Pythagoras's (√2)
- Digit 1,973 = 4
- ln 2 — Natural log of 2
- Digit 1,973 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,973 = 3
Also seen as
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.181.
- Address
- 0.0.7.181
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.181
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,973 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B6 (1975.5 Hz, -2¢)
- Scientific pitch (C4 = 256 Hz): B6 (1933.1 Hz, +35¢)
- Baroque pitch (A4 = 415 Hz): C7 (1974.1 Hz, -1¢)
The digit sequence 1973 first appears in π at position 1,641 of the decimal expansion (the 1,641ordinal-suffix:st 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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.