618
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 1248
- Proper Divisor Sum (Aliquot Sum)
- 630
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 204
- Möbius Function
- -1
- Radical
- 618
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 25
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- sechshundertachtzehn· ordinal: sechshundertachtzehnste
- English
- six hundred eighteen· ordinal: six hundred eighteenth
- Spanish
- seiscientos dieciocho· ordinal: 618º
- French
- six cent dix-huit· ordinal: six cent dix-huitième
- Italian
- seicentodiciotto· ordinal: 618º
- Latin
- sescenti duodeviginti· ordinal: 618.
- Portuguese
- seiscentos e dezoito· ordinal: 618º
Appears in sequences
- Even sequences with period 2n.at n=8A000206
- Numbers beginning with letter 's' in English.at n=42A000870
- Number of n-step self-avoiding walks on hexagonal [ =triangular ] lattice.at n=4A001334
- a(1) = 1; thereafter a(n+1) = floor(sqrt(2*a(n)*(a(n)+1))).at n=17A001521
- Number of connected graphs on n labeled nodes, each node being colored with one of 3 colors, such that no edge joins nodes of the same color.at n=4A002028
- Matrices with 2 rows.at n=5A002136
- The square sieve.at n=43A002960
- Numbers that are the sum of 10 positive 5th powers.at n=25A003355
- Tetrahedral numbers written backwards.at n=16A004161
- Number of ternary squarefree words of length n.at n=15A006156
- Inverse Moebius transform of Fibonacci numbers 1,1,2,3,5,8,...at n=14A007435
- Impractical numbers: even abundant numbers (A173490) that are not practical(2) (A007620).at n=30A007621
- Coordination sequence T5 for Zeolite Code GOO.at n=17A008115
- Coordination sequence T7 for Zeolite Code MEL.at n=16A008156
- Coordination sequence T1 for Zeolite Code MOR.at n=16A008182
- Number of partitions of n into at most 7 parts.at n=23A008636
- Expansion of (1+x)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=31A008762
- Coordination sequence T3 for Zeolite Code -WEN.at n=18A009864
- Coordination sequence T4 for Zeolite Code iRON.at n=18A009884
- arctan(sinh(x)+arcsin(x))=2*x-14/3!*x^3+618/5!*x^5-67854/7!*x^7...at n=2A013036