155,440
155,440 is a composite number, even.
155,440 (one hundred fifty-five thousand four hundred forty) is an even 6-digit number. It is a composite number with 40 divisors, and factors as 2⁴ × 5 × 29 × 67. Its proper divisors sum to 224,000, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x25F30.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 19
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 44,551
- Recamán's sequence
- a(477,239) = 155,440
- Square (n²)
- 24,161,593,600
- Cube (n³)
- 3,755,678,109,184,000
- Divisor count
- 40
- σ(n) — sum of divisors
- 379,440
- φ(n) — Euler's totient
- 59,136
- Sum of prime factors
- 109
Primality
Prime factorization: 2 4 × 5 × 29 × 67
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√155,440 = [394; (3, 1, 6, 2, 1, 4, 1, 3, 1, 5, 3, 7, 1, 8, 1, 5, 1, 8, 1, 7, 3, 5, 1, 3, …)]
Period length 32 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifty-five thousand four hundred forty
- Ordinal
- 155440th
- Binary
- 100101111100110000
- Octal
- 457460
- Hexadecimal
- 0x25F30
- Base64
- Al8w
- One's complement
- 4,294,811,855 (32-bit)
- Scientific notation
- 1.5544 × 10⁵
- As a duration
- 155,440 s = 1 day, 19 hours, 10 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρνευμʹ
- Mayan (base 20)
- 𝋳·𝋨·𝋬·𝋠
- Chinese
- 一十五萬五千四百四十
- Chinese (financial)
- 壹拾伍萬伍仟肆佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 155440, here are decompositions:
- 17 + 155423 = 155440
- 41 + 155399 = 155440
- 53 + 155387 = 155440
- 59 + 155381 = 155440
- 107 + 155333 = 155440
- 113 + 155327 = 155440
- 137 + 155303 = 155440
- 149 + 155291 = 155440
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A5 BC B0 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.95.48.
- Address
- 0.2.95.48
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.95.48
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 155,440 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 155440 first appears in π at position 817,835 of the decimal expansion (the 817,835ordinal-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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.