1,865
1,865 is a composite number, odd, a calendar year.
Notable events — 1865 AD
- Apr 9 Robert E. Lee surrenders to Ulysses S. Grant at Appomattox Court House.
- Apr 14 President Lincoln is shot at Ford's Theatre; he dies the next morning.
- Dec 6 The 13th Amendment is ratified, abolishing slavery in the US.
- Dec 24 The Ku Klux Klan is founded in Pulaski, Tennessee.
- Jul 14 Edward Whymper makes the first ascent of the Matterhorn.
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
-
Sunday
January 1, 1865
- Ended on
-
Sunday
December 31, 1865
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 16
Sunday, April 16, 1865
- Decade
-
1860s
1860–1869
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
161
161 years before 2026.
In other calendars
- Hebrew
-
5625 / 5626 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1281 / 1282 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
-
2408 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1243 / 1244 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1857 / 1858 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1787 / 1786 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 20
- Digit product
- 240
- Digital root
- 2
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,681
- Recamán's sequence
- a(8,014) = 1,865
- Square (n²)
- 3,478,225
- Cube (n³)
- 6,486,889,625
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,244
- φ(n) — Euler's totient
- 1,488
- Sum of prime factors
- 378
Primality
Prime factorization: 5 × 373
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred sixty-five
- Ordinal
- 1865th
- Roman numeral
- MDCCCLXV
- Binary
- 11101001001
- Octal
- 3511
- Hexadecimal
- 0x749
- Base64
- B0k=
- One's complement
- 63,670 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹 𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωξεʹ
- Mayan (base 20)
- 𝋤·𝋭·𝋥
- Chinese
- 一千八百六十五
- Chinese (financial)
- 壹仟捌佰陸拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,865 = 1
- e — Euler's number (e)
- Digit 1,865 = 3
- φ — Golden ratio (φ)
- Digit 1,865 = 9
- √2 — Pythagoras's (√2)
- Digit 1,865 = 3
- ln 2 — Natural log of 2
- Digit 1,865 = 8
- γ — Euler-Mascheroni (γ)
- Digit 1,865 = 4
Also seen as
UTF-8 encoding: DD 89 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.73.
- Address
- 0.0.7.73
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.73
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1865 first appears in π at position 9,168 of the decimal expansion (the 9,168ordinal-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.