1488
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 20
- Divisor Sum
- 3968
- Proper Divisor Sum (Aliquot Sum)
- 2480
- 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
- 480
- Möbius Function
- 0
- Radical
- 186
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 21
- 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 monosubstituted alkanes C(n-1)H(2n-1)-X with n-1 carbon atoms that are stereoisomers.at n=10A000620
- Expansion of g.f. (1 + x + 2*x^2)/((1 - x)^2*(1 - x^3)).at n=46A000969
- Generalized sum of divisors function.at n=30A002132
- Absolute value of Glaisher's alpha(n).at n=17A002290
- Expansion of (x-1)*(x^2-4*x-1)/(1-2*x)^2.at n=7A003232
- Coordination sequence T2 for Zeolite Code EAB and OFF.at n=28A008083
- Number of 3 X 3 symmetric stochastic matrices under row and column permutations.at n=44A008764
- a(n) = lcm(n, sigma(n)).at n=47A009242
- Coordination sequence T2 for Zeolite Code ZON.at n=27A009920
- Numbers k such that k divides phi(k) * sigma(k).at n=45A011775
- a(n) = floor( n*(n-1)*(n-2)/20 ).at n=32A011902
- a(n) = floor( n*(n-1)*(n-2)/22 ).at n=33A011904
- Apply partial sum operator 4 times to Stern's sequence.at n=8A014175
- Multiplicity of K_3 in K_n.at n=35A014557
- Average of twin prime pairs.at n=49A014574
- Values of n where (phi(n) * sigma(n))/n is an integer and increases.at n=30A015707
- Number of subsets of { 1, ..., n } containing an A.P. of length 9.at n=17A018794
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for square lattice.at n=6A019266
- T(2n+1,n+4), T given by A026758.at n=4A026879
- a(n) = n^2 + n + 6.at n=38A027691