2229
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2976
- Proper Divisor Sum (Aliquot Sum)
- 747
- 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
- 1484
- Möbius Function
- 1
- Radical
- 2229
- Omega Function (Ω)
- 2
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 45
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- no
- Odd
- yes
Appears in sequences
- Number of partitions of n, with three kinds of 1,2 and 3 and two kinds of 4,5,6,....at n=10A000715
- Coordination sequence T3 for Zeolite Code EPI.at n=30A008092
- Coordination sequence T3 for Zeolite Code MTW.at n=31A008198
- Numbers k such that the continued fraction for sqrt(k) has period 40.at n=9A020379
- n-th Lucas number (A000204(n)) + n-th non-Lucas number (A090946(n+1)).at n=15A022801
- a(n) = b(n) + d(n), where b(n) = (n-th Lucas number A000204 > 1) and d(n) = (n-th non-Fibonacci number).at n=14A023485
- Duplicate of A022801.at n=15A023492
- Coordination sequence T4 for Zeolite Code IFR.at n=33A024985
- a(n) = T(n,1) + T(n-1,2) + ...+ T(n-k+1,k), where k = floor((n+1)/2) and T is the array defined in A026098.at n=22A026103
- Numbers k such that k*(3k-1)/2 is a pentagonal palindrome.at n=8A028386
- Positions of record values in A030787.at n=44A030792
- 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 30.at n=24A031528
- Concatenation of n and n+7.at n=21A032612
- Numbers whose maximal base-10 run length is 3.at n=37A033284
- Coordination sequence T3 for Zeolite Code SBE.at n=38A033606
- a(n) = C(n+2,3) + 2*C(n,2) + 2*(n-2).at n=20A034857
- Smallest number that takes n steps to reach 0 under "k->max product of 2 numbers whose concatenation is k".at n=12A035932
- Total number of different legs traversed by all loops of length 2n in A038515.at n=12A038516
- Numbers whose base-7 representation contains exactly three 3's.at n=23A043407
- Numbers having three 2's in base 10.at n=14A043499