1,258
1,258 is a composite number, even, a calendar year.
Notable events — 1258 AD
- Feb 10 Mongol forces sack Baghdad, ending the Abbasid Caliphate.
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
-
Tuesday
January 1, 1258
- Ended on
-
Tuesday
December 31, 1258
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1250s
1250–1259
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
768
768 years before 2026.
In other calendars
- Hebrew
-
5018 / 5019 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
655 / 656 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Horse
Sexagenary cycle position 55 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1801 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
636 / 637 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1250 / 1251 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1180 / 1179 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 17 × 37
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred fifty-eight
- Ordinal
- 1258th
- Roman numeral
- MCCLVIII
- Binary
- 10011101010
- Octal
- 2352
- Hexadecimal
- 0x4EA
- Base64
- BOo=
- One's complement
- 64,277 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασνηʹ
- Mayan (base 20)
- 𝋣·𝋢·𝋲
- Chinese
- 一千二百五十八
- Chinese (financial)
- 壹仟貳佰伍拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,258 = 5
- e — Euler's number (e)
- Digit 1,258 = 8
- φ — Golden ratio (φ)
- Digit 1,258 = 1
- √2 — Pythagoras's (√2)
- Digit 1,258 = 5
- ln 2 — Natural log of 2
- Digit 1,258 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,258 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1258, here are decompositions:
- 29 + 1229 = 1258
- 41 + 1217 = 1258
- 71 + 1187 = 1258
- 107 + 1151 = 1258
- 149 + 1109 = 1258
- 167 + 1091 = 1258
- 197 + 1061 = 1258
- 227 + 1031 = 1258
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 AA (2 bytes).
Code page 1258 is Windows-1258 (Vietnamese) — Microsoft Windows encoding for Vietnamese.
Code pages are integer identifiers used by Windows and other systems to refer to specific character encodings.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.234.
- Address
- 0.0.4.234
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.234
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 1258 first appears in π at position 3,346 of the decimal expansion (the 3,346ordinal-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.