200 (number)
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|---|---|---|---|---|
| Cardinal | two hundred | |||
| Ordinal | 200th (two hundredth) | |||
| Factorization | 23 × 52 | |||
| Greek numeral | Σ´ | |||
| Roman numeral | CC, cc | |||
| Binary | 110010002 | |||
| Ternary | 211023 | |||
| Senary | 5326 | |||
| Octal | 3108 | |||
| Duodecimal | 14812 | |||
| Hexadecimal | C816 | |||
| Armenian | Մ | |||
| Hebrew | ר | |||
| Babylonian cuneiform | 𒐗⟪ | |||
| Egyptian hieroglyph | 𓍣 | |||
200 (two hundred) is the natural number following 199 and preceding 201.
In mathematics
[edit]200 is an abundant number,[1] as 265, the sum of its proper divisors, is greater than itself.[2]
The number appears in the Padovan sequence, preceded by 86, 114, and 151 (it is the sum of the first two of these).[3]
The sum of Euler's totient function φ(x) over the first twenty-five integers is 200.[4]
200 is the smallest base 10 unprimeable number – it cannot be turned into a prime number by changing just one of its digits to any other digit.[5] It is also a Harshad number.[6]
200 is an Achilles number.[7]
References
[edit]
Look up two hundred in Wiktionary, the free dictionary.
- ↑ "A005101 - OEIS". oeis.org. Retrieved 2026-06-17.
- ↑ Weisstein, Eric W. "Abundant Number". mathworld.wolfram.com. Retrieved 2026-06-17.
- ↑ "Sloane's A000931 : Padovan sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ↑ "A002088 - OEIS". oeis.org. Retrieved 2026-06-17.
- ↑ (sequence A192545 in the OEIS)
- ↑ Sloane, N. J. A. (ed.). "Sequence A005349 (Niven (or Harshad, or harshad) numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Sloane, N. J. A. (ed.). "Sequence A052486 (Achilles numbers - powerful but imperfect: if n = Product(p_i^e_i) then all e_i > 1 (i.e., powerful), but the highest common factor of the e_i is 1, i.e., not a perfect power)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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