1,287
1,287 is a composite number, odd, a calendar year.
Historical context — 1287 AD
Calendar year
Year 1287 (MCCLXXXVII) was a common year starting on Wednesday of the Julian calendar.
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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
-
Wednesday
January 1, 1287
- Ended on
-
Wednesday
December 31, 1287
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1280s
1280–1289
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
739
739 years before 2026.
In other calendars
- Hebrew
-
5047 / 5048 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
685 / 686 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Pig
Sexagenary cycle position 24 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1830 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
665 / 666 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1279 / 1280 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1209 / 1208 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 18
- Digit product
- 112
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 7,821
- Recamán's sequence
- a(30,474) = 1,287
- Square (n²)
- 1,656,369
- Cube (n³)
- 2,131,746,903
- Divisor count
- 12
- σ(n) — sum of divisors
- 2,184
- φ(n) — Euler's totient
- 720
- Sum of prime factors
- 30
Primality
Prime factorization: 3 2 × 11 × 13
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred eighty-seven
- Ordinal
- 1287th
- Roman numeral
- MCCLXXXVII
- Binary
- 10100000111
- Octal
- 2407
- Hexadecimal
- 0x507
- Base64
- BQc=
- One's complement
- 64,248 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασπζʹ
- Mayan (base 20)
- 𝋣·𝋤·𝋧
- Chinese
- 一千二百八十七
- Chinese (financial)
- 壹仟貳佰捌拾柒
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,287 = 4
- e — Euler's number (e)
- Digit 1,287 = 9
- φ — Golden ratio (φ)
- Digit 1,287 = 9
- √2 — Pythagoras's (√2)
- Digit 1,287 = 6
- ln 2 — Natural log of 2
- Digit 1,287 = 6
- γ — Euler-Mascheroni (γ)
- Digit 1,287 = 2
Also seen as
UTF-8 encoding: D4 87 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.7.
- Address
- 0.0.5.7
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.7
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.
The digit sequence 1287 first appears in π at position 14,719 of the decimal expansion (the 14,719ordinal-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.