13862
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 21600
- Proper Divisor Sum (Aliquot Sum)
- 7738
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6664
- Möbius Function
- -1
- Radical
- 13862
- Omega Function (Ω)
- 3
- 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
- 151
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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 Fielder sequence.at n=14A001645
- a(n) = floor(10000*log(n)).at n=3A004243
- a(n) = (d(n)-r(n))/2, where d = A026063 and r is the periodic sequence with fundamental period (1,1,0,1).at n=44A026064
- Base-9 palindromes that start with 2.at n=29A043029
- Numbers k such that Euler phi(k) / Carmichael lambda(k) = 14.at n=30A066696
- a(n) = (p^2 - p + 2)/2 for p = prime(n); number of squares modulo p^2.at n=38A072205
- Square root of sum defined in A007475(n) and A001032(n).at n=27A076215
- Product of Lucas (A000204) and a Pell Companion series (A002203).at n=6A085293
- a(n) = floor(10^n*log(n)).at n=3A095255
- a(n) = (n^3 + 4*n^2 - n)/2.at n=28A162260
- O.g.f.: exp( Sum_{n>=1} (sigma(2*n^3) - sigma(n^3)) * x^n/n ).at n=8A225958
- Number of partitions p of n such that (sum of parts with multiplicity 1) <= (sum of all other parts).at n=38A240449
- G.f.: Sum_{n>=1} Pell(n+1) * x^n / (1 - x^n), where Pell(n) = A000129(n).at n=10A256272
- Numbers n such that 4n + 1, 4n + 2 and 4n + 3 are not squarefree.at n=31A258332
- Palindromic numbers in bases 3 and 9 written in base 10.at n=45A259386
- Least number x such that x^n has n digits equal to k. Case k = 6.at n=19A285453
- Number of prime parts in the partitions of n into 6 parts.at n=50A309433