155,980
155,980 is a composite number, even.
155,980 (one hundred fifty-five thousand nine hundred eighty) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2² × 5 × 11 × 709. Its proper divisors sum to 201,860, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x2614C.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 28
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 89,551
- Recamán's sequence
- a(205,904) = 155,980
- Square (n²)
- 24,329,760,400
- Cube (n³)
- 3,794,956,027,192,000
- Divisor count
- 24
- σ(n) — sum of divisors
- 357,840
- φ(n) — Euler's totient
- 56,640
- Sum of prime factors
- 729
Primality
Prime factorization: 2 2 × 5 × 11 × 709
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√155,980 = [394; (1, 16, 1, 1, 4, 9, 1, 1, 7, 1, 3, 1, 2, 1, 3, 1, 7, 1, 1, 9, 4, 1, 1, 16, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifty-five thousand nine hundred eighty
- Ordinal
- 155980th
- Binary
- 100110000101001100
- Octal
- 460514
- Hexadecimal
- 0x2614C
- Base64
- AmFM
- One's complement
- 4,294,811,315 (32-bit)
- Scientific notation
- 1.5598 × 10⁵
- As a duration
- 155,980 s = 1 day, 19 hours, 19 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρνεϡπʹ
- Mayan (base 20)
- 𝋳·𝋩·𝋳·𝋠
- Chinese
- 一十五萬五千九百八十
- Chinese (financial)
- 壹拾伍萬伍仟玖佰捌拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 155980, here are decompositions:
- 59 + 155921 = 155980
- 89 + 155891 = 155980
- 131 + 155849 = 155980
- 179 + 155801 = 155980
- 197 + 155783 = 155980
- 233 + 155747 = 155980
- 239 + 155741 = 155980
- 257 + 155723 = 155980
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A6 85 8C (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.97.76.
- Address
- 0.2.97.76
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.97.76
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 155,980 and was likely granted around 1873.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.