415
415 is a composite number, odd, a calendar year.
Historical context — 415 AD
Calendar year
Year 415 (CDXV) was a common year starting on Friday of the Julian calendar.
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Historical context — 415 BC
Calendar year
Year 415 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 415
- Ended on
-
Thursday
December 31, 415
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
410s
410–419
- Century
-
5th century
401–500
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,611
1611 years before 2026.
In other calendars
- Hebrew
-
4175 / 4176 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Wood zodiac:Rabbit
Sexagenary cycle position 52 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
958 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
407 / 408 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
337 / 336 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 83
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- four hundred fifteen
- Ordinal
- 415th
- Roman numeral
- CDXV
- Binary
- 110011111
- Octal
- 637
- Hexadecimal
- 0x19F
- Base64
- AZ8=
- One's complement
- 65,120 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- υιεʹ
- Mayan (base 20)
- 𝋡·𝋠·𝋯
- Chinese
- 四百一十五
- Chinese (financial)
- 肆佰壹拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 415 = 9
- e — Euler's number (e)
- Digit 415 = 5
- φ — Golden ratio (φ)
- Digit 415 = 7
- √2 — Pythagoras's (√2)
- Digit 415 = 9
- ln 2 — Natural log of 2
- Digit 415 = 3
- γ — Euler-Mascheroni (γ)
- Digit 415 = 7
Also seen as
UTF-8 encoding: C6 9F (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.159.
- Address
- 0.0.1.159
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.159
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 415 is an active NANP area code (North American Numbering Plan).
- Primary area
- San Francisco / Marin
- Region
- California
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.