1644
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 3864
- Proper Divisor Sum (Aliquot Sum)
- 2220
- 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
- 544
- Möbius Function
- 0
- Radical
- 822
- Omega Function (Ω)
- 4
- 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
- 135
- 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
- a(n) = Fibonacci(n+2) + prime(n).at n=14A004399
- a(n) = floor(n*phi^8), where phi is the golden ratio, A001622.at n=35A004923
- a(n) = round(n*phi^8), where phi is the golden ratio, A001622.at n=35A004943
- Coordination sequence T2 for Zeolite Code LOV.at n=27A008135
- Coordination sequence T2 for Zeolite Code MAZ.at n=28A008145
- Coordination sequence T4 for Zeolite Code MEL.at n=26A008153
- Coordination sequence T7 for Zeolite Code MTT.at n=25A008195
- Coordination sequence T3 for Zeolite Code NES.at n=26A008207
- Molien series for A_4.at n=47A008627
- Coordination sequence T3 for Zeolite Code DFO.at n=31A009877
- Number of lines through exactly 7 points of an n X n grid of points.at n=36A018814
- Number of words of length n (n >= 1) over a two-letter alphabet having a minimal period of size n-2.at n=12A019311
- Index of 9^n within the sequence of the numbers of the form 7^i*9^j.at n=53A025737
- a(n) = (d(n)-r(n))/2, where d = A026046 and r is the periodic sequence with fundamental period (0,1,0,1).at n=17A026047
- a(n) = dot_product(n,n-1,...2,1)*(5,6,...,n,1,2,3,4).at n=13A026060
- Number of partitions of n that do not contain 5 as a part.at n=26A027339
- a(n) = n^2 + n + 4.at n=40A027689
- Floor(exp(19/23) * n!).at n=5A030810
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 20.at n=24A031518
- Coordination sequence T3 for Zeolite Code CFI.at n=27A033601