165,820
165,820 is a composite number, even.
165,820 (one hundred sixty-five thousand eight hundred twenty) is an even 6-digit number. It is a composite number with 12 divisors, and factors as 2² × 5 × 8,291. Its proper divisors sum to 182,444, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x287BC.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 22
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 28,561
- Recamán's sequence
- a(196,352) = 165,820
- Square (n²)
- 27,496,272,400
- Cube (n³)
- 4,559,431,889,368,000
- Divisor count
- 12
- σ(n) — sum of divisors
- 348,264
- φ(n) — Euler's totient
- 66,320
- Sum of prime factors
- 8,300
Primality
Prime factorization: 2 2 × 5 × 8291
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√165,820 = [407; (4, 1, 3, 5, 4, 1, 13, 1, 2, 1, 3, 1, 2, 7, 1, 2, 2, 1, 1, 3, 1, 1, 3, 4, …)]
Period length 56 — the block in parentheses repeats forever.
Representations
- In words
- one hundred sixty-five thousand eight hundred twenty
- Ordinal
- 165820th
- Binary
- 101000011110111100
- Octal
- 503674
- Hexadecimal
- 0x287BC
- Base64
- Aoe8
- One's complement
- 4,294,801,475 (32-bit)
- Scientific notation
- 1.6582 × 10⁵
- As a duration
- 165,820 s = 1 day, 22 hours, 3 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρξεωκʹ
- Chinese
- 一十六萬五千八百二十
- Chinese (financial)
- 壹拾陸萬伍仟捌佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 165820, here are decompositions:
- 3 + 165817 = 165820
- 41 + 165779 = 165820
- 71 + 165749 = 165820
- 101 + 165719 = 165820
- 107 + 165713 = 165820
- 113 + 165707 = 165820
- 167 + 165653 = 165820
- 233 + 165587 = 165820
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A8 9E BC (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.135.188.
- Address
- 0.2.135.188
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.135.188
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 165,820 and was likely granted around 1874.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 165820 first appears in π at position 351,180 of the decimal expansion (the 351,180ordinal-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°.