“440 (number)”的意思、由来-开放百科全书

词条

440 (number)

释义

In mathematics
References

{{About|the number||440 (disambiguation)}}{{Infobox number
| number = 440
| divisor = 1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 55, 110, 220, 440
| lang1 = Hebrew
| lang1 symbol = מת (Tav)(Mem)
}}

440 (four hundred [and] forty) is the natural number following 439 and preceding 441.

In mathematics

440 has the factorization {{math| 2³ · 5 · 11.}}

440 is:

even
the sum of the first 17 prime numbers
an abundant number^[1]
a Harshad number
a happy number^[2]

References

1. ^{{Cite web|url=http://numbermatics.com/n/440/|title=Facts about the number 440|work=Numbermatics - the number explorer|access-date=2017-03-21}}
2. ^{{cite book |last1=Guy |first1=Richard |title=Unsolved Problems in Number Theory |date=March 9, 2013 |publisher=Springer Science & Business Media |isbn=9780387266770 |page=358 |url=https://books.google.com/books?id=1BnoBwAAQBAJ&pg=PA358 |language=en}}

1 : Integers

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