1,439
1,439 is a prime, odd, a calendar year.
1,439 (one thousand four hundred thirty-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 MCDXXXIX and in binary, 10110011111.
Interestingness
Historical context — 1439 AD
Calendar year
.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 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
-
Tuesday
January 1, 1439
- Ended on
-
Tuesday
December 31, 1439
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1430s
1430–1439
- Century
-
15th century
1401–1500
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
587
587 years before 2026.
In other calendars
- Hebrew
-
5199 / 5200 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
842 / 843 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Goat
Sexagenary cycle position 56 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1982 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
817 / 818 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1431 / 1432 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1361 / 1360 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,439 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,439 = [37; (1, 14, 5, 2, 1, 5, 6, 1, 2, 1, 1, 2, 2, 1, 10, 7, 2, 37, 2, 7, 10, 1, 2, 2, …)]
Period length 36 — the block in parentheses repeats forever.
Representations
- In words
- one thousand four hundred thirty-nine
- Ordinal
- 1439th
- Roman numeral
- MCDXXXIX
- Binary
- 10110011111
- Octal
- 2637
- Hexadecimal
- 0x59F
- Base64
- BZ8=
- One's complement
- 64,096 (16-bit)
- Scientific notation
- 1.439 × 10³
- As a duration
- 1,439 s = 23 minutes, 59 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αυλθʹ
- Mayan (base 20)
- 𝋣·𝋫·𝋳
- Chinese
- 一千四百三十九
- Chinese (financial)
- 壹仟肆佰參拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,439 = 0
- e — Euler's number (e)
- Digit 1,439 = 2
- φ — Golden ratio (φ)
- Digit 1,439 = 1
- √2 — Pythagoras's (√2)
- Digit 1,439 = 8
- ln 2 — Natural log of 2
- Digit 1,439 = 8
- γ — Euler-Mascheroni (γ)
- Digit 1,439 = 1
Also seen as
UTF-8 encoding: D6 9F (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.159.
- Address
- 0.0.5.159
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.159
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,439 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F♯6 (1480 Hz, -49¢ — about midway to F6)
- Scientific pitch (C4 = 256 Hz): F♯6 (1448.2 Hz, -11¢)
- Baroque pitch (A4 = 415 Hz): G6 (1478.9 Hz, -47¢ — about midway to F♯6)
The digit sequence 1439 first appears in π at position 13,137 of the decimal expansion (the 13,137ordinal-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.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.