Number

418

418 is a composite number, even, a calendar year.

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Sphenic Number Squarefree Year

Historical context — 418 AD

Calendar year

Year 418 (CDXVIII) was a common year starting on Tuesday of the Julian calendar.

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Historical context — 418 BC

Calendar year

Year 418 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: Monday
January 1, 418
Ended on: Monday
December 31, 418
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 410s
410–419
Century: 5th century
401–500
Millennium: 1st millennium
1–1000
Years ago: 1,608
1608 years before 2026.

In other calendars

Hebrew: 4178 / 4179 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Horse
Sexagenary cycle position 55 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 961 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 410 / 411 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 340 / 339 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 13
Digit product: 32
Digital root: 4
Palindrome: No
Bit width: 9 bits
Reversed: 814
Recamán's sequence: a(480) = 418
Square (n²): 174,724
Cube (n³): 73,034,632
Divisor count: 8
σ(n) — sum of divisors: 720
φ(n) — Euler's totient: 180
Sum of prime factors: 32

Primality

Prime factorization: 2 × 11 × 19

Nearest primes: 409 (−9) · 419 (+1)

Divisors & multiples

All divisors (8)

1 · 2 · 11 · 19 · 22 · 38 · 209 (half) · 418

Aliquot sum (sum of proper divisors): 302

Factor pairs (a × b = 418)

1 × 418

2 × 209

11 × 38

19 × 22

First multiples

418 · 836 (double) · 1,254 · 1,672 · 2,090 · 2,508 · 2,926 · 3,344 · 3,762 · 4,180

Sums & aliquot sequence

As consecutive integers: 103 + 104 + 105 + 106 33 + 34 + … + 43 13 + 14 + … + 31

Aliquot sequence: 418 → 302 → 154 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: four hundred eighteen
Ordinal: 418th
Roman numeral: CDXVIII
Binary: 110100010
Octal: 642
Hexadecimal: 0x1A2
Base64: AaI=
One's complement: 65,117 (16-bit)

In other bases

ternary (3) 120111

quaternary (4) 12202

quinary (5) 3133

senary (6) 1534

septenary (7) 1135

nonary (9) 514

undecimal (11) 350

duodecimal (12) 2aa

tridecimal (13) 262

tetradecimal (14) 21c

pentadecimal (15) 1cd

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): υιηʹ
Mayan (base 20): 𝋡·𝋠·𝋲
Chinese: 四百一十八
Chinese (financial): 肆佰壹拾捌

In other modern scripts

Eastern Arabic ٤١٨ Devanagari ४१८ Bengali ৪১৮ Tamil ௪௧௮ Thai ๔๑๘ Tibetan ༤༡༨ Khmer ៤១៨ Lao ໔໑໘ Burmese ၄၁၈

Digit at this position in famous constants

π — Pi (π): Digit 418 = 1
e — Euler's number (e): Digit 418 = 8
φ — Golden ratio (φ): Digit 418 = 9
√2 — Pythagoras's (√2): Digit 418 = 4
ln 2 — Natural log of 2: Digit 418 = 3
γ — Euler-Mascheroni (γ): Digit 418 = 6

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 418, here are decompositions:

17 + 401 = 418
29 + 389 = 418
59 + 359 = 418
71 + 347 = 418
101 + 317 = 418
107 + 311 = 418
137 + 281 = 418
149 + 269 = 418

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Capital Letter Oi

U+01A2

Uppercase letter (Lu)

UTF-8 encoding: C6 A2 (2 bytes).

Lookup U+01A2 on Compart ↗ Lookup on FileFormat.Info ↗

HTTP status code

HTTP 418 I'm a teapot — RFC 2324 — short and stout. Returned by some servers as an Easter egg.

4xx class: Client Error.

Hex color

#0001A2

RGB(0, 1, 162)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.162.

Address: 0.0.1.162
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.162

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 418

The number 418 is an active NANP area code (North American Numbering Plan).

Primary area: Quebec City / Eastern Québec
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.

Look up area code 418 ↗