5426
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8142
- Proper Divisor Sum (Aliquot Sum)
- 2716
- 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
- 2712
- Möbius Function
- 1
- Radical
- 5426
- 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
- 160
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) = round(1000*log_2(n)).at n=42A004266
- Twelve iterations of Reverse and Add are needed to reach a palindrome.at n=37A015993
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite PAU = Paulingite (K2,Ca,Na2)76[Al152Si520O1344] starting with a T6 atom.at n=5A019054
- Numbers k such that the continued fraction for sqrt(k) has period 19.at n=33A020358
- Number of dyslexic rooted planar trees with n nodes where any 2 subtrees extending from the same node are different.at n=13A032066
- Number of partitions of n into parts not of the form 21k, 21k+2 or 21k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 9 are greater than 1.at n=35A035980
- Coordination sequence T6 for Zeolite Code MTF.at n=44A057309
- a(n) = (9*n^2 + 13*n + 6)/2.at n=34A064226
- Numbers which need 12 'Reverse and Add' steps to reach a palindrome.at n=37A065217
- a(n) is the least index such that the least primitive root of the a(n)-th prime is n, or zero if no such prime exists.at n=17A066529
- a(n) = (n^3 - 7*n + 12)/6.at n=31A105163
- Numbers n such that sum of n-th and (n+1)-st semiprimes is a square=q^2.at n=36A109311
- Number of partitions of n in which each part, with the possible exception of the largest, occurs at least three times.at n=47A116932
- Numbers k such that p(k+1)# + p(k)# - p(k-1)# - 1 is prime where p(i)# = product of first i primes = A002110(i).at n=15A128661
- a(n) = (9*n^2 - 5*n + 2)/2.at n=35A140064
- a(n) = 5*n^2 + 20*n + 1.at n=31A162316
- Numbers k such that k$ + 1 is prime. Here '$' denotes the swinging factorial function (A056040).at n=55A163077
- Number of right triangles on an (n+1) X 5 grid.at n=12A189809
- a(n) = Sum_{i+j=n, i,j >= 1} tau(i)*sigma(j), where tau() = A000005(), sigma() = A000203().at n=44A191831
- Number of conjugacy classes of primitive elements in GF(7^n) which have trace 0.at n=6A192509