3,987
3,987 is a composite number, odd.
3,987 (three thousand nine hundred eighty-seven) is an odd 4-digit number. It is a composite number with 6 divisors, and factors as 3² × 443. Written other ways, in Roman numerals it is MMMCMLXXXVII and in binary, 111110010011.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 27
- Digit product
- 1,512
- Digital root
- 9
- Palindrome
- No
- Bit width
- 12 bits
- Reversed
- 7,893
- Recamán's sequence
- a(14,417) = 3,987
- Square (n²)
- 15,896,169
- Cube (n³)
- 63,378,025,803
- Divisor count
- 6
- σ(n) — sum of divisors
- 5,772
- φ(n) — Euler's totient
- 2,652
- Sum of prime factors
- 449
Primality
Prime factorization: 3 2 × 443
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√3,987 = [63; (7, 126)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- three thousand nine hundred eighty-seven
- Ordinal
- 3987th
- Roman numeral
- MMMCMLXXXVII
- Binary
- 111110010011
- Octal
- 7623
- Hexadecimal
- 0xF93
- Base64
- D5M=
- One's complement
- 61,548 (16-bit)
- Scientific notation
- 3.987 × 10³
- As a duration
- 3,987 s = 1 hour, 6 minutes, 27 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵γϡπζʹ
- Mayan (base 20)
- 𝋩·𝋳·𝋧
- Chinese
- 三千九百八十七
- Chinese (financial)
- 參仟玖佰捌拾柒
Digit at this position in famous constants
- π — Pi (π)
- Digit 3,987 = 6
- e — Euler's number (e)
- Digit 3,987 = 7
- φ — Golden ratio (φ)
- Digit 3,987 = 5
- √2 — Pythagoras's (√2)
- Digit 3,987 = 9
- ln 2 — Natural log of 2
- Digit 3,987 = 4
- γ — Euler-Mascheroni (γ)
- Digit 3,987 = 5
Also seen as
UTF-8 encoding: E0 BE 93 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.15.147.
- Address
- 0.0.15.147
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.15.147
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 3,987 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B7 (3951.1 Hz, +16¢)
- Scientific pitch (C4 = 256 Hz): C8 (4096 Hz, -47¢ — about midway to B7)
- Baroque pitch (A4 = 415 Hz): C8 (3948.2 Hz, +17¢)
The digit sequence 3987 first appears in π at position 20,746 of the decimal expansion (the 20,746ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.