15,990
15,990 is a composite number, even.
15,990 (fifteen thousand nine hundred ninety) is an even 5-digit number. It is a composite number with 32 divisors, and factors as 2 × 3 × 5 × 13 × 41. Its proper divisors sum to 26,346, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x3E76.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 24
- Digit product
- 0
- Digital root
- 6
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 9,951
- Recamán's sequence
- a(45,335) = 15,990
- Square (n²)
- 255,680,100
- Cube (n³)
- 4,088,324,799,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 42,336
- φ(n) — Euler's totient
- 3,840
- Sum of prime factors
- 64
Primality
Prime factorization: 2 × 3 × 5 × 13 × 41
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√15,990 = [126; (2, 4, 1, 1, 1, 24, 1, 1, 1, 4, 2, 252)]
Period length 12 — the block in parentheses repeats forever.
Representations
- In words
- fifteen thousand nine hundred ninety
- Ordinal
- 15990th
- Binary
- 11111001110110
- Octal
- 37166
- Hexadecimal
- 0x3E76
- Base64
- PnY=
- One's complement
- 49,545 (16-bit)
- Scientific notation
- 1.599 × 10⁴
- As a duration
- 15,990 s = 4 hours, 26 minutes, 30 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ιεϡϟʹ
- Mayan (base 20)
- 𝋡·𝋳·𝋳·𝋪
- Chinese
- 一萬五千九百九十
- Chinese (financial)
- 壹萬伍仟玖佰玖拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 15,990 = 1
- e — Euler's number (e)
- Digit 15,990 = 1
- φ — Golden ratio (φ)
- Digit 15,990 = 2
- √2 — Pythagoras's (√2)
- Digit 15,990 = 4
- ln 2 — Natural log of 2
- Digit 15,990 = 1
- γ — Euler-Mascheroni (γ)
- Digit 15,990 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 15990, here are decompositions:
- 17 + 15973 = 15990
- 19 + 15971 = 15990
- 31 + 15959 = 15990
- 53 + 15937 = 15990
- 67 + 15923 = 15990
- 71 + 15919 = 15990
- 83 + 15907 = 15990
- 89 + 15901 = 15990
Showing the first eight; more decompositions exist.
UTF-8 encoding: E3 B9 B6 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.62.118.
- Address
- 0.0.62.118
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.62.118
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 15,990 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B9 (15804.3 Hz, +20¢)
- Scientific pitch (C4 = 256 Hz): C10 (16384 Hz, -42¢)
- Baroque pitch (A4 = 415 Hz): C10 (15792.7 Hz, +21¢)
The digit sequence 15990 first appears in π at position 219,709 of the decimal expansion (the 219,709ordinal-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°.