12888
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 27
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 35100
- Proper Divisor Sum (Aliquot Sum)
- 22212
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4272
- Möbius Function
- 0
- Radical
- 1074
- 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
- 24
- 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
- Generalized tangent numbers d_(n,2).at n=14A000176
- a(n) = diagonal sum of left-justified array T given by A027052.at n=27A027069
- Sorted number reached from A033863(n) by Sort-then-add.at n=9A033864
- Sorted number reached from A033863(n) by Sort-then-add.at n=10A033864
- Sorted number reached from A033863(n) by Sort-then-add.at n=11A033864
- Sort then Add, a(1) =9.at n=15A033896
- Sort then Add, a(1)=27.at n=13A033903
- Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 9 sites wide.at n=48A058364
- Geometric mean of the digits = 4. In other words, the product of the digits is = 4^k where k is the number of digits.at n=45A061428
- A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the 7 pairs of complementary target ratios needed to express the 12 unsymmetrical steps of the untempered (Just Intonation) scale known as the Duodene: 3/2 and 4/3, 5/4 and 8/5, 6/5 and 5/3, 9/8 and 16/9, 10/9 and 9/5, 16/15 and 15/8 and 45/32 and 64/45.at n=30A061920
- Geometric mean of digits = 4 and digits are in nondecreasing order.at n=10A069518
- Numbers k such that the number of steps to reach 1 in '3x+1' problem equals tau(k), the number of divisors of k.at n=17A070980
- Total area below the lattice paths of length n defined by the rule [(0),(k)->(k-1)(k+1)] (Dyck paths).at n=10A094893
- Numbers k for which digitsum(k) + digitsum(k^2) + digitsum(k^3) = digitsum(k^4).at n=30A118470
- Lower triangular array called S2hat(-4) related to partition number array A144284.at n=16A144285
- Second column (m=2) of triangle S2hat(-4) = A144285.at n=4A144339
- Total sum of even parts in the last section of the set of partitions of n.at n=28A206436
- Number of 2 X 2 matrices having all terms in {1,...,n} and determinant >=3n.at n=15A211063
- Number of (w,x,y,z) with all terms in {1,...,n} and w<=|x-y|+|y-z|.at n=12A212673
- Minimum possible number of cycles without repeated edges on a multigraph with 3 vertices and n edges (when each vertex pair must have at least one edge).at n=7A263103