1,218
1,218 is a composite number, even, a calendar year.
Historical context — 1218 AD
Calendar year
Year 1218 (MCCXVIII) was a common year starting on Monday 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
-
Monday
January 1, 1218
- Ended on
-
Monday
December 31, 1218
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1210s
1210–1219
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
808
808 years before 2026.
In other calendars
- Hebrew
-
4978 / 4979 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
614 / 615 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Tiger
Sexagenary cycle position 15 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1761 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
596 / 597 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1210 / 1211 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1140 / 1139 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 12
- Digit product
- 16
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 8,121
- Recamán's sequence
- a(8,552) = 1,218
- Square (n²)
- 1,483,524
- Cube (n³)
- 1,806,932,232
- Divisor count
- 16
- σ(n) — sum of divisors
- 2,880
- φ(n) — Euler's totient
- 336
- Sum of prime factors
- 41
Primality
Prime factorization: 2 × 3 × 7 × 29
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred eighteen
- Ordinal
- 1218th
- Roman numeral
- MCCXVIII
- Binary
- 10011000010
- Octal
- 2302
- Hexadecimal
- 0x4C2
- Base64
- BMI=
- One's complement
- 64,317 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασιηʹ
- Mayan (base 20)
- 𝋣·𝋠·𝋲
- Chinese
- 一千二百一十八
- Chinese (financial)
- 壹仟貳佰壹拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,218 = 6
- e — Euler's number (e)
- Digit 1,218 = 3
- φ — Golden ratio (φ)
- Digit 1,218 = 4
- √2 — Pythagoras's (√2)
- Digit 1,218 = 5
- ln 2 — Natural log of 2
- Digit 1,218 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,218 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1218, here are decompositions:
- 5 + 1213 = 1218
- 17 + 1201 = 1218
- 31 + 1187 = 1218
- 37 + 1181 = 1218
- 47 + 1171 = 1218
- 67 + 1151 = 1218
- 89 + 1129 = 1218
- 101 + 1117 = 1218
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 82 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.194.
- Address
- 0.0.4.194
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.194
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1218 first appears in π at position 9,166 of the decimal expansion (the 9,166ordinal-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.