1,345
1,345 is a composite number, odd, a calendar year.
1,345 (one thousand three hundred forty-five) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 5 × 269. Written other ways, in Roman numerals it is MCCCXLV and in binary, 10101000001.
Interestingness
Historical context — 1345 AD
Calendar year
Year 1345 (MCCCXLV) was a common year starting on Saturday 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
-
Friday
January 1, 1345
- Ended on
-
Friday
December 31, 1345
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1340s
1340–1349
- Century
-
14th century
1301–1400
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
681
681 years before 2026.
In other calendars
- Hebrew
-
5105 / 5106 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
745 / 746 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1888 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
723 / 724 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1337 / 1338 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1267 / 1266 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 269
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,345 = [36; (1, 2, 14, 2, 1, 72)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- one thousand three hundred forty-five
- Ordinal
- 1345th
- Roman numeral
- MCCCXLV
- Binary
- 10101000001
- Octal
- 2501
- Hexadecimal
- 0x541
- Base64
- BUE=
- One's complement
- 64,190 (16-bit)
- Scientific notation
- 1.345 × 10³
- As a duration
- 1,345 s = 22 minutes, 25 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ατμεʹ
- Mayan (base 20)
- 𝋣·𝋧·𝋥
- Chinese
- 一千三百四十五
- Chinese (financial)
- 壹仟參佰肆拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,345 = 0
- e — Euler's number (e)
- Digit 1,345 = 2
- φ — Golden ratio (φ)
- Digit 1,345 = 9
- √2 — Pythagoras's (√2)
- Digit 1,345 = 1
- ln 2 — Natural log of 2
- Digit 1,345 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,345 = 2
Also seen as
UTF-8 encoding: D5 81 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.65.
- Address
- 0.0.5.65
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.65
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,345 Hz is closest to:
- Concert pitch (A4 = 440 Hz): E6 (1318.5 Hz, +34¢)
- Scientific pitch (C4 = 256 Hz): F6 (1366.9 Hz, -28¢)
- Baroque pitch (A4 = 415 Hz): F6 (1317.5 Hz, +36¢)
The digit sequence 1345 first appears in π at position 9,392 of the decimal expansion (the 9,392ordinal-suffix:nd 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.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.