1,290
1,290 is a composite number, even, a calendar year.
Historical context — 1290 AD
Calendar year
Year 1290 (MCCXC) was a common year starting on Sunday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →
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, 1290
- Ended on
-
Sunday
December 31, 1290
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1290s
1290–1299
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
736
736 years before 2026.
In other calendars
- Hebrew
-
5050 / 5051 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
688 / 689 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Tiger
Sexagenary cycle position 27 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1833 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
668 / 669 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1282 / 1283 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1212 / 1211 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 3 × 5 × 43
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred ninety
- Ordinal
- 1290th
- Roman numeral
- MCCXC
- Binary
- 10100001010
- Octal
- 2412
- Hexadecimal
- 0x50A
- Base64
- BQo=
- One's complement
- 64,245 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ασϟʹ
- Mayan (base 20)
- 𝋣·𝋤·𝋪
- Chinese
- 一千二百九十
- Chinese (financial)
- 壹仟貳佰玖拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,290 = 8
- e — Euler's number (e)
- Digit 1,290 = 4
- φ — Golden ratio (φ)
- Digit 1,290 = 2
- √2 — Pythagoras's (√2)
- Digit 1,290 = 4
- ln 2 — Natural log of 2
- Digit 1,290 = 8
- γ — Euler-Mascheroni (γ)
- Digit 1,290 = 2
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1290, here are decompositions:
- 7 + 1283 = 1290
- 11 + 1279 = 1290
- 13 + 1277 = 1290
- 31 + 1259 = 1290
- 41 + 1249 = 1290
- 53 + 1237 = 1290
- 59 + 1231 = 1290
- 61 + 1229 = 1290
Showing the first eight; more decompositions exist.
UTF-8 encoding: D4 8A (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.10.
- Address
- 0.0.5.10
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.10
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 1290 first appears in π at position 712 of the decimal expansion (the 712ordinal-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.