13698
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
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 29718
- Proper Divisor Sum (Aliquot Sum)
- 16020
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4560
- Möbius Function
- 0
- Radical
- 4566
- 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
- 58
- 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) = A000522(n) - 2.at n=6A026243
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 26.at n=8A031704
- Numbers k such that k^2 contains exactly 9 different digits.at n=16A054037
- Number of nodes at the n-th level of the Inverse-Totient-Tree (ITT) with the root at 1, and edges connecting number m to all numbers k such that phi(k) = m.at n=12A058811
- Numbers k such that 3^k + 4 is prime.at n=21A058958
- a(n) = 81*n^2 + 9.at n=12A157888
- Numerators of n!*(1 + 1/2 + 1/3 +...+ 1/(n+1)).at n=7A160039
- a(n) = 169*n^2 + n.at n=8A173275
- a(n) = floor(n!*h(n)/n), where h(n) = Sum_{k=1..n} 1/k.at n=7A180589
- Total number of parts that are the smallest part or the largest part in all partitions of n.at n=25A182978
- Number of quadrilaterals on an n X n grid (or geoboard).at n=4A189414
- Numbers n such that n contains exactly 5 digits, all distinct, and n^2 contains exactly 9 distinct digits.at n=5A204691
- Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.at n=8A346135
- Numbers k such that 1 is in the transitive closure of the map x -> A353313(x) when starting iterating from x=k.at n=47A353306
- Number of n-regular, N_0-weighted pseudographs on 2 vertices with total edge weight 9, up to isomorphism.at n=40A358249
- Numbers k such that any two consecutive decimal digits of k^2 differ by 1 after arranging the digits in decreasing order.at n=30A370362