5548
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 10360
- Proper Divisor Sum (Aliquot Sum)
- 4812
- 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
- 2592
- Möbius Function
- 0
- Radical
- 2774
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 67
- 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
- Coefficients for step-by-step integration.at n=3A002399
- a(n) = least m such that if r and s in {1/3, 1/6, 1/9,..., 1/3n} satisfy r < s, then r < k/m < s for some integer k.at n=48A024824
- T(2n,n+1), T given by A026769.at n=6A026883
- Same rule as Aitken triangle (A011971) except a(0,0)=1, a(1,0)=0.at n=42A046934
- Sequence formed from rows of triangle A046934.at n=33A046935
- Numbers n such that 65*2^n-1 is prime.at n=24A050558
- Numbers k such that k | sigma_6(k).at n=29A055710
- Numbers n such that n | sigma_12(n).at n=12A055716
- Third spoke of a hexagonal spiral.at n=43A056107
- Numbers k such that k and its reversal are both multiples of 19.at n=19A062907
- Non-palindromic number and its reversal are both multiples of 19.at n=10A062916
- Number of 2 X 2 singular integer matrices with elements from {0,...,n} up to row and column permutation.at n=46A064276
- a(n) = (3*n+1)*(3*n+4).at n=24A085001
- 0*9, 1*8, 2*7, 3*6, 4*5; 10*19, 11*18, ..., 14*15; 20*29, 21*28, ..., 24*25; 30*39, ...at n=38A096229
- Sum of the areas of the Durfee squares of all partitions of n.at n=20A116503
- a(n) = n * A006218(n).at n=37A143274
- Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.at n=15A146939
- Elias omega coded prime numbers represented in decimal.at n=13A147764
- Number of pairs of rabbits in month n in the dying rabbits problem, if they become mature after 4 months and give birth to exactly 7 pairs, one per month.at n=30A160333
- Number of "ON" cells at n-th stage in simple 2-dimensional cellular automaton (see Comments for precise definition).at n=45A160410