200 (number)

Template:Infobox number 200 (two hundred) is the natural number following 199 and preceding 201.

In mathematics

200 is an abundant number, as 265, the sum of its proper divisors, is greater than itself.

The number appears in the Padovan sequence, preceded by 86, 114, and 151 (it is the sum of the first two of these).<ref>Template:Cite web</ref>

The sum of Euler's totient function φ(x) over the first twenty-five integers is 200.

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.<ref>Template:OEIS</ref> It is also a Harshad number.<ref>Template:Cite OEIS</ref>

200 is an Achilles number.<ref>Template:Cite OEIS</ref>

References

Template:Wiktionary <references />