Live analysis

18,008

18,008 is a composite number, even.

This number doesn't have a permanent NumberWiki page yet — what you see below is computed live. Pages get added to the permanent index when they're notable (years, primes, curated, etc.).

18,008 (eighteen thousand eight) is an even 5-digit number. It is a composite number with 8 divisors, and factors as 2³ × 2,251. Written other ways, in hexadecimal, 0x4658.

Deficient Number Evil Number Flippable Happy Number Recamán's Sequence Refactorable Number

Interestingness

★ ★ ☆ ☆ ☆

4 notable facts · grade D

17,996 17,997 17,998 17,999 18,000 18,001 18,002 18,003 18,004 18,005 18,006 18,007 18,008 18,009 18,010 18,011 18,012 18,013 18,014 18,015 18,016 18,017 18,018 18,019 18,020

less more

Properties

Parity: Even
Digit count: 5
Digit sum: 17
Digit product: 0
Digital root: 8
Palindrome: No
Bit width: 15 bits
Reversed: 80,081
Flips to (rotate 180°): 80,081
Recamán's sequence: a(8,144) = 18,008
Square (n²): 324,288,064
Cube (n³): 5,839,779,456,512
Divisor count: 8
σ(n) — sum of divisors: 33,780
φ(n) — Euler's totient: 9,000
Sum of prime factors: 2,257

Primality

Prime factorization: 2 ³ × 2251

Nearest primes: 17,989 (−19) · 18,013 (+5)

Divisors & multiples

All divisors (8)

1 · 2 · 4 · 8 · 2251 · 4502 · 9004 (half) · 18008

Aliquot sum (sum of proper divisors): 15,772

Factor pairs (a × b = 18,008)

1 × 18008

2 × 9004

4 × 4502

8 × 2251

First multiples

18,008 · 36,016 (double) · 54,024 · 72,032 · 90,040 · 108,048 · 126,056 · 144,064 · 162,072 · 180,080

Sums & aliquot sequence

As consecutive integers: 1,118 + 1,119 + … + 1,133

Aliquot sequence: 18,008 → 15,772 → 11,836 → 10,844 → 8,140 → 11,012 → 8,266 → 4,136 → 4,504 → 3,956 → 3,436 → 2,584 → 2,816 → 3,316 → 2,494 → 1,466 → 736 — unresolved within range

Continued fraction of √n

√18,008 = [134; (5, 6, 2, 1, 7, 1, 37, 2, 5, 4, 1, 1, 1, 1, 3, 5, 1, 4, 1, 1, 1, 3, 33, 3, …)]

Period length 46 — the block in parentheses repeats forever.

Representations

In words: eighteen thousand eight
Ordinal: 18008th
Binary: 100011001011000
Octal: 43130
Hexadecimal: 0x4658
Base64: Rlg=
One's complement: 47,527 (16-bit)
Scientific notation: 1.8008 × 10⁴
As a duration: 18,008 s = 5 hours, 8 seconds

In other bases

ternary (3) 220200222

quaternary (4) 10121120

quinary (5) 1034013

senary (6) 215212

septenary (7) 103334

nonary (9) 26628

undecimal (11) 12591

duodecimal (12) a508

tridecimal (13) 8273

tetradecimal (14) 67c4

pentadecimal (15) 5508

As an angle

18,008° = 50 × 360° + 8°

8° ≈ 0.14 rad

Compass bearing: N (north)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 · 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵ιηηʹ
Mayan (base 20): 𝋢·𝋥·𝋠·𝋨
Chinese: 一萬八千零八
Chinese (financial): 壹萬捌仟零捌

In other modern scripts

Eastern Arabic ١٨٠٠٨ Devanagari १८००८ Bengali ১৮০০৮ Tamil ௧௮௦௦௮ Thai ๑๘๐๐๘ Tibetan ༡༨༠༠༨ Khmer ១៨០០៨ Lao ໑໘໐໐໘ Burmese ၁၈၀၀၈

Digit at this position in famous constants

π — Pi (π): Digit 18,008 = 1
e — Euler's number (e): Digit 18,008 = 3
φ — Golden ratio (φ): Digit 18,008 = 6
√2 — Pythagoras's (√2): Digit 18,008 = 4
ln 2 — Natural log of 2: Digit 18,008 = 5
γ — Euler-Mascheroni (γ): Digit 18,008 = 4

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 18008, here are decompositions:

19 + 17989 = 18008
31 + 17977 = 18008
37 + 17971 = 18008
79 + 17929 = 18008
97 + 17911 = 18008
127 + 17881 = 18008
157 + 17851 = 18008
181 + 17827 = 18008

Showing the first eight; more decompositions exist.

Unicode codepoint

䙘

CJK Unified Ideograph-4658

U+4658

Other letter (Lo)

UTF-8 encoding: E4 99 98 (3 bytes).

Lookup U+4658 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#004658

RGB(0, 70, 88)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.70.88.

Address: 0.0.70.88
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.70.88

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

Musical pitch

Heard as a frequency, 18,008 Hz is closest to:

Concert pitch (A4 = 440 Hz): C♯10 (17739.7 Hz, +26¢)
Scientific pitch (C4 = 256 Hz): D10 (18390.4 Hz, -36¢)
Baroque pitch (A4 = 415 Hz): D10 (17726.7 Hz, +27¢)

Position in π

The digit sequence 18008 first appears in π at position 176,041 of the decimal expansion (the 176,041ordinal-suffix:st 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.

Look up 18008 on Pi Search ↗