438
438 is a composite number, even, a calendar year.
Historical context — 438 AD
Calendar year
Year 438 (CDXXXVIII) was a common year starting on Saturday of the Julian calendar.
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Historical context — 438 BC
Calendar year
Year 438 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, 438
- Ended on
-
Friday
December 31, 438
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
430s
430–439
- Century
-
5th century
401–500
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,588
1588 years before 2026.
In other calendars
- Hebrew
-
4198 / 4199 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Tiger
Sexagenary cycle position 15 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
981 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
430 / 431 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
360 / 359 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 3 × 73
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- four hundred thirty-eight
- Ordinal
- 438th
- Roman numeral
- CDXXXVIII
- Binary
- 110110110
- Octal
- 666
- Hexadecimal
- 0x1B6
- Base64
- AbY=
- One's complement
- 65,097 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- υληʹ
- Mayan (base 20)
- 𝋡·𝋡·𝋲
- Chinese
- 四百三十八
- Chinese (financial)
- 肆佰參拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 438 = 1
- e — Euler's number (e)
- Digit 438 = 8
- φ — Golden ratio (φ)
- Digit 438 = 2
- √2 — Pythagoras's (√2)
- Digit 438 = 5
- ln 2 — Natural log of 2
- Digit 438 = 6
- γ — Euler-Mascheroni (γ)
- Digit 438 = 3
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 438, here are decompositions:
- 5 + 433 = 438
- 7 + 431 = 438
- 17 + 421 = 438
- 19 + 419 = 438
- 29 + 409 = 438
- 37 + 401 = 438
- 41 + 397 = 438
- 59 + 379 = 438
Showing the first eight; more decompositions exist.
UTF-8 encoding: C6 B6 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.182.
- Address
- 0.0.1.182
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.182
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 438 is an active NANP area code (North American Numbering Plan).
- Primary area
- Montreal
- Region
- Québec
- Country
- Canada
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.