605
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 798
- Proper Divisor Sum (Aliquot Sum)
- 193
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 440
- Möbius Function
- 0
- Radical
- 55
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 17
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- no
- Odd
- yes
Names
- German
- sechshundertfünf· ordinal: sechshundertfünfste
- English
- six hundred five· ordinal: six hundred fifth
- Spanish
- seiscientos cinco· ordinal: 605º
- French
- six cent cinq· ordinal: six cent cinqième
- Italian
- seicentocinque· ordinal: 605º
- Latin
- sescenti quinque· ordinal: 605.
- Portuguese
- seiscentos e cinco· ordinal: 605º
Appears in sequences
- Numbers m such that Fibonacci(m) ends with m.at n=22A000350
- Numbers beginning with letter 's' in English.at n=29A000870
- Number of plane partitions of n with at most two rows.at n=13A000990
- Trajectory of 1 under map x->x + (x-with-digits-reversed).at n=7A001127
- A generalized Fibonacci sequence.at n=37A001584
- Expansion of 1/(1 - x*exp(x) + x^2*exp(2*x) - x^3*exp(3*x)).at n=5A003017
- Numbers of the form 5^i * 11^j.at n=8A003598
- Inverse Möbius transform of A003959.at n=47A003969
- Representation degeneracies for boson strings.at n=23A005291
- Positions of remoteness 3 in Beans-Don't-Talk.at n=17A005695
- Number of fractions in Farey series of order n.at n=44A005728
- a(n) = n*(n+1)^2/2.at n=10A006002
- Let S denote the palindromes in the language {0,1,2,3,4}*; a(n) = number of words of length n in the language SS.at n=5A007058
- Oscillates under partition transform.at n=32A007212
- Coordination sequence T3 for Zeolite Code BRE.at n=16A008060
- Coordination sequence T1 for Zeolite Code MAZ.at n=17A008144
- Coordination sequence T3 for Zeolite Code MOR.at n=16A008184
- Coordination sequence T6 for Zeolite Code PAU.at n=18A008224
- Numbers that do not contain the letter 't'.at n=35A008523
- Molien series for Weyl group F_4.at n=57A008670