1,872
1,872 is a composite number, even, a calendar year.
Notable events — 1872 AD
- Mar 1 Yellowstone becomes the world's first national park.
- Nov 5 Susan B. Anthony illegally casts a vote in the US presidential election; Grant wins re-election.
- Nov 9 The Great Boston Fire of 1872 destroys 65 acres of downtown.
- Apr 2 Inventor Samuel F. B. Morse dies in New York.
- Dec 5 The Mary Celeste is found drifting and abandoned in the Atlantic.
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
- 52
- Started on
-
Monday
January 1, 1872
- Ended on
-
Tuesday
December 31, 1872
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
March 31
Sunday, March 31, 1872
- Decade
-
1870s
1870–1879
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
154
154 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
In other calendars
- Hebrew
-
5632 / 5633 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1288 / 1289 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Monkey
Sexagenary cycle position 9 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2415 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1250 / 1251 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1864 / 1865 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1794 / 1793 Saka
Indian national calendar; year starts in March.
- Japanese
-
Meiji 5
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 18
- Digit product
- 112
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 2,781
- Recamán's sequence
- a(8,000) = 1,872
- Square (n²)
- 3,504,384
- Cube (n³)
- 6,560,206,848
- Divisor count
- 30
- σ(n) — sum of divisors
- 5,642
- φ(n) — Euler's totient
- 576
- Sum of prime factors
- 27
Primality
Prime factorization: 2 4 × 3 2 × 13
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred seventy-two
- Ordinal
- 1872nd
- Roman numeral
- MDCCCLXXII
- Binary
- 11101010000
- Octal
- 3520
- Hexadecimal
- 0x750
- Base64
- B1A=
- One's complement
- 63,663 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹 𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵αωοβʹ
- Mayan (base 20)
- 𝋤·𝋭·𝋬
- Chinese
- 一千八百七十二
- Chinese (financial)
- 壹仟捌佰柒拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,872 = 2
- e — Euler's number (e)
- Digit 1,872 = 2
- φ — Golden ratio (φ)
- Digit 1,872 = 7
- √2 — Pythagoras's (√2)
- Digit 1,872 = 8
- ln 2 — Natural log of 2
- Digit 1,872 = 0
- γ — Euler-Mascheroni (γ)
- Digit 1,872 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1872, here are decompositions:
- 5 + 1867 = 1872
- 11 + 1861 = 1872
- 41 + 1831 = 1872
- 61 + 1811 = 1872
- 71 + 1801 = 1872
- 83 + 1789 = 1872
- 89 + 1783 = 1872
- 113 + 1759 = 1872
Showing the first eight; more decompositions exist.
UTF-8 encoding: DD 90 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.80.
- Address
- 0.0.7.80
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.80
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1872 first appears in π at position 7,292 of the decimal expansion (the 7,292ordinal-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.