1,399
1,399 is a prime, odd, a calendar year.
1,399 (one thousand three hundred ninety-nine) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is MCCCXCIX and in binary, 10101110111.
Interestingness
Historical context — 1399 AD
Calendar year
Year 1399 (MCCCXCIX) 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
-
Tuesday
January 1, 1399
- Ended on
-
Tuesday
December 31, 1399
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1390s
1390–1399
- Century
-
14th century
1301–1400
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
627
627 years before 2026.
In other calendars
- Hebrew
-
5159 / 5160 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
801 / 802 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Rabbit
Sexagenary cycle position 16 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1942 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
777 / 778 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1391 / 1392 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1321 / 1320 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,399 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,399 = [37; (2, 2, 12, 14, 1, 7, 2, 1, 1, 1, 4, 2, 1, 3, 2, 7, 24, 1, 4, 37, 4, 1, 24, 7, …)]
Period length 40 — the block in parentheses repeats forever.
Representations
- In words
- one thousand three hundred ninety-nine
- Ordinal
- 1399th
- Roman numeral
- MCCCXCIX
- Binary
- 10101110111
- Octal
- 2567
- Hexadecimal
- 0x577
- Base64
- BXc=
- One's complement
- 64,136 (16-bit)
- Scientific notation
- 1.399 × 10³
- As a duration
- 1,399 s = 23 minutes, 19 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ατϟθʹ
- Mayan (base 20)
- 𝋣·𝋩·𝋳
- Chinese
- 一千三百九十九
- Chinese (financial)
- 壹仟參佰玖拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,399 = 2
- e — Euler's number (e)
- Digit 1,399 = 8
- φ — Golden ratio (φ)
- Digit 1,399 = 6
- √2 — Pythagoras's (√2)
- Digit 1,399 = 7
- ln 2 — Natural log of 2
- Digit 1,399 = 4
- γ — Euler-Mascheroni (γ)
- Digit 1,399 = 2
Also seen as
UTF-8 encoding: D5 B7 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.119.
- Address
- 0.0.5.119
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.119
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,399 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F6 (1396.9 Hz, +3¢)
- Scientific pitch (C4 = 256 Hz): F6 (1366.9 Hz, +40¢)
- Baroque pitch (A4 = 415 Hz): F♯6 (1395.9 Hz, +4¢)
The digit sequence 1399 first appears in π at position 13,014 of the decimal expansion (the 13,014ordinal-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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.