155,820
155,820 is a composite number, even.
155,820 (one hundred fifty-five thousand eight hundred twenty) is an even 6-digit number. It is a composite number with 72 divisors, and factors as 2² × 3 × 5 × 7² × 53. Its proper divisors sum to 361,284, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x260AC.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 21
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 28,551
- Recamán's sequence
- a(206,224) = 155,820
- Square (n²)
- 24,279,872,400
- Cube (n³)
- 3,783,289,717,368,000
- Divisor count
- 72
- σ(n) — sum of divisors
- 517,104
- φ(n) — Euler's totient
- 34,944
- Sum of prime factors
- 79
Primality
Prime factorization: 2 2 × 3 × 5 × 7 2 × 53
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√155,820 = [394; (1, 2, 1, 5, 1, 3, 2, 3, 1, 1, 2, 2, 2, 1, 12, 1, 2, 15, 1, 3, 2, 1, 5, 2, …)]
Period length 52 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifty-five thousand eight hundred twenty
- Ordinal
- 155820th
- Binary
- 100110000010101100
- Octal
- 460254
- Hexadecimal
- 0x260AC
- Base64
- AmCs
- One's complement
- 4,294,811,475 (32-bit)
- Scientific notation
- 1.5582 × 10⁵
- As a duration
- 155,820 s = 1 day, 19 hours, 17 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρνεωκʹ
- Mayan (base 20)
- 𝋳·𝋩·𝋫·𝋠
- Chinese
- 一十五萬五千八百二十
- Chinese (financial)
- 壹拾伍萬伍仟捌佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 155820, here are decompositions:
- 11 + 155809 = 155820
- 19 + 155801 = 155820
- 23 + 155797 = 155820
- 37 + 155783 = 155820
- 43 + 155777 = 155820
- 47 + 155773 = 155820
- 73 + 155747 = 155820
- 79 + 155741 = 155820
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A6 82 AC (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.96.172.
- Address
- 0.2.96.172
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.96.172
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 155,820 and was likely granted around 1873.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 155820 first appears in π at position 605,385 of the decimal expansion (the 605,385ordinal-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°.