1188
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 3360
- Proper Divisor Sum (Aliquot Sum)
- 2172
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 360
- Möbius Function
- 0
- Radical
- 66
- Omega Function (Ω)
- 6
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 75
- Smith Number
- no
- Vampire 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
- yes
- Odd
- no
Appears in sequences
- Number of secondary alcohols (alkanols or alkyl alcohols C_n H_{2n+1} OH) with n carbon atoms.at n=11A000599
- Numbers k such that 17*2^k - 1 is prime.at n=20A001774
- 2nd differences are periodic.at n=25A002082
- a(n) = floor(n(n+2)(2n+1)/8).at n=16A002717
- Self numbers divisible by sum of their digits (or, self numbers which are also Harshad numbers).at n=30A003219
- Numbers that are the sum of 10 positive 5th powers.at n=50A003355
- Degrees of irreducible representations of symmetric group S_11.at n=47A003875
- Expansion of (1 + 2*x + x^2)/(1 - 10*x + x^2).at n=3A004291
- a(n)=least number m such that m-a(n-1)<>a(j)-a(k) for all j,k less than m; a(1)=1, a(2)=3.at n=33A004979
- Smallest number that requires n iterations of the bi-unitary totient function (A116550) to reach 1.at n=27A005424
- a(n) = floor(phi*a(n-2)) + a(n-1) where phi is the golden ratio.at n=12A005834
- Number of unsensed planar maps with n edges and without loops or isthmuses.at n=9A006399
- McKay-Thompson series of class 3B for the Monster group.at n=5A007244
- a(n) = phi(n) * (sigma(n) - n).at n=53A007517
- Coordination sequence T2 for Zeolite Code AFT.at n=26A008027
- Coordination sequence T2 for Zeolite Code ATV.at n=22A008044
- Coordination sequence T2 for Zeolite Code LTN.at n=24A008141
- Coordination sequence T4 for Zeolite Code MEI.at n=25A008149
- Coordination sequence T6 for Zeolite Code NES.at n=22A008210
- a(n) is the concatenation of n and 8n.at n=10A009470