449
449 is a prime, odd, a calendar year.
449 (four hundred forty-nine) is an odd 3-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is CDXLIX and in binary, 111000001.
Interestingness
Historical context — 449 AD
Calendar year
Year 449 (CDXLIX) was a common year starting on Saturday of the Julian calendar.
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Historical context — 449 BC
Calendar year
Year 449 BC was a year of the pre-Julian Roman 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, 449
- Ended on
-
Friday
December 31, 449
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
440s
440–449
- Century
-
5th century
401–500
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,577
1577 years before 2026.
In other calendars
- Hebrew
-
4209 / 4210 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
992 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
441 / 442 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
371 / 370 Saka
Indian national calendar; year starts in March.
Properties
Primality
449 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√449 = [21; (5, 3, 1, 1, 1, 7, 1, 5, 5, 1, 7, 1, 1, 1, 3, 5, 42)]
Period length 17 — the block in parentheses repeats forever.
Representations
- In words
- four hundred forty-nine
- Ordinal
- 449th
- Roman numeral
- CDXLIX
- Binary
- 111000001
- Octal
- 701
- Hexadecimal
- 0x1C1
- Base64
- AcE=
- One's complement
- 65,086 (16-bit)
- Scientific notation
- 4.49 × 10²
- As a duration
- 449 s = 7 minutes, 29 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- υμθʹ
- Mayan (base 20)
- 𝋡·𝋢·𝋩
- Chinese
- 四百四十九
- Chinese (financial)
- 肆佰肆拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 449 = 5
- e — Euler's number (e)
- Digit 449 = 6
- φ — Golden ratio (φ)
- Digit 449 = 0
- √2 — Pythagoras's (√2)
- Digit 449 = 4
- ln 2 — Natural log of 2
- Digit 449 = 6
- γ — Euler-Mascheroni (γ)
- Digit 449 = 9
Also seen as
UTF-8 encoding: C7 81 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.193.
- Address
- 0.0.1.193
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.193
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 449 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A4 (440 Hz, +35¢)
- Scientific pitch (C4 = 256 Hz): A♯4 (456.1 Hz, -27¢)
- Baroque pitch (A4 = 415 Hz): A♯4 (439.7 Hz, +36¢)
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.