155,420
155,420 is a composite number, even.
155,420 (one hundred fifty-five thousand four hundred twenty) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2² × 5 × 19 × 409. Its proper divisors sum to 188,980, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x25F1C.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 17
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 24,551
- Recamán's sequence
- a(477,279) = 155,420
- Square (n²)
- 24,155,376,400
- Cube (n³)
- 3,754,228,600,088,000
- Divisor count
- 24
- σ(n) — sum of divisors
- 344,400
- φ(n) — Euler's totient
- 58,752
- Sum of prime factors
- 437
Primality
Prime factorization: 2 2 × 5 × 19 × 409
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√155,420 = [394; (4, 3, 1, 1, 10, 1, 1, 5, 1, 156, 1, 5, 1, 1, 10, 1, 1, 3, 4, 788)]
Period length 20 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifty-five thousand four hundred twenty
- Ordinal
- 155420th
- Binary
- 100101111100011100
- Octal
- 457434
- Hexadecimal
- 0x25F1C
- Base64
- Al8c
- One's complement
- 4,294,811,875 (32-bit)
- Scientific notation
- 1.5542 × 10⁵
- As a duration
- 155,420 s = 1 day, 19 hours, 10 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρνευκʹ
- Mayan (base 20)
- 𝋳·𝋨·𝋫·𝋠
- Chinese
- 一十五萬五千四百二十
- Chinese (financial)
- 壹拾伍萬伍仟肆佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 155420, here are decompositions:
- 7 + 155413 = 155420
- 37 + 155383 = 155420
- 43 + 155377 = 155420
- 103 + 155317 = 155420
- 151 + 155269 = 155420
- 211 + 155209 = 155420
- 229 + 155191 = 155420
- 283 + 155137 = 155420
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A5 BC 9C (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.95.28.
- Address
- 0.2.95.28
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.95.28
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 155,420 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.