18,100
18,100 is a composite number, even.
18,100 (eighteen thousand one hundred) is an even 5-digit number. It is a composite number with 18 divisors, and factors as 2² × 5² × 181. Its proper divisors sum to 21,394, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x46B4.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 10
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 181
- Flips to (rotate 180°)
- 181
- Recamán's sequence
- a(15,856) = 18,100
- Square (n²)
- 327,610,000
- Cube (n³)
- 5,929,741,000,000
- Divisor count
- 18
- σ(n) — sum of divisors
- 39,494
- φ(n) — Euler's totient
- 7,200
- Sum of prime factors
- 195
Primality
Prime factorization: 2 2 × 5 2 × 181
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√18,100 = [134; (1, 1, 6, 2, 1, 1, 23, 1, 6, 1, 1, 16, 3, 1, 1, 8, 1, 2, 2, 2, 1, 8, 1, 1, …)]
Period length 38 — the block in parentheses repeats forever.
Representations
- In words
- eighteen thousand one hundred
- Ordinal
- 18100th
- Binary
- 100011010110100
- Octal
- 43264
- Hexadecimal
- 0x46B4
- Base64
- RrQ=
- One's complement
- 47,435 (16-bit)
- Scientific notation
- 1.81 × 10⁴
- As a duration
- 18,100 s = 5 hours, 1 minute, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢
- Greek (Milesian)
- ͵ιηρʹ
- Mayan (base 20)
- 𝋢·𝋥·𝋥·𝋠
- Chinese
- 一萬八千一百
- Chinese (financial)
- 壹萬捌仟壹佰
Digit at this position in famous constants
- π — Pi (π)
- Digit 18,100 = 0
- e — Euler's number (e)
- Digit 18,100 = 0
- φ — Golden ratio (φ)
- Digit 18,100 = 8
- √2 — Pythagoras's (√2)
- Digit 18,100 = 4
- ln 2 — Natural log of 2
- Digit 18,100 = 5
- γ — Euler-Mascheroni (γ)
- Digit 18,100 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 18100, here are decompositions:
- 3 + 18097 = 18100
- 11 + 18089 = 18100
- 23 + 18077 = 18100
- 41 + 18059 = 18100
- 53 + 18047 = 18100
- 59 + 18041 = 18100
- 113 + 17987 = 18100
- 179 + 17921 = 18100
Showing the first eight; more decompositions exist.
UTF-8 encoding: E4 9A B4 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.70.180.
- Address
- 0.0.70.180
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.70.180
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 18,100 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯10 (17739.7 Hz, +35¢)
- Scientific pitch (C4 = 256 Hz): D10 (18390.4 Hz, -28¢)
- Baroque pitch (A4 = 415 Hz): D10 (17726.7 Hz, +36¢)
The digit sequence 18100 first appears in π at position 52,389 of the decimal expansion (the 52,389ordinal-suffix:th 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.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.