6237
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 20
- Divisor Sum
- 11616
- Proper Divisor Sum (Aliquot Sum)
- 5379
- 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
- 3240
- Möbius Function
- 0
- Radical
- 231
- 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
- 62
- 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
- no
- Odd
- yes
Appears in sequences
- MacMahon's generalized sum of divisors function.at n=17A002128
- a(n) = (4*n+1)*(4*n+5).at n=19A003185
- Nim product 2^n * 2^n.at n=12A006017
- Denominators of expansion of sinh x / sin x.at n=40A006656
- Number of n-celled polygons with perimeter 2n+2 on square lattice.at n=8A006725
- Triangle T(n,k), n>=1, read by rows, where T(n,k) is the number of lattice polygons with area n and perimeter 2*k.at n=21A008855
- Positive numbers having the same set of digits in base 6 and base 8.at n=39A037435
- Numerators of continued fraction convergents to sqrt(447).at n=2A041850
- Numbers whose base-5 representation contains exactly two 2's and three 4's.at n=19A045288
- Odd numbers divisible by exactly 6 primes (counted with multiplicity).at n=16A046319
- Numbers whose sum of the squares of divisors is also a square number.at n=9A046655
- a(n)=T(n,n+1), array T as in A049735.at n=31A049741
- Numbers k such that k | 6^k + 5^k + 4^k + 3^k + 2^k + 1^k.at n=35A056745
- Numbers with more than one factorization into S-primes. See A054520 and A057948 for definition.at n=37A057949
- Trajectory of 22 under the Reverse and Add! operation carried out in base 2.at n=15A061561
- Least m such that n = m mod tau(m) if such m exists, otherwise 0.at n=16A066708
- Numbers k such that k divides Sum_{i=1..k} gcd(k,i) = A018804(k).at n=36A066862
- Smallest k such that n^8+k^8, n^4+k^4, n^2+k^2, n+k are simultaneously prime.at n=31A071564
- a(n) = p(5n+4)/5 where p(k) denotes the k-th partition number.at n=7A071734
- a(n) = (2*n+5)*(2*n+1).at n=38A078371