11638
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 19908
- Proper Divisor Sum (Aliquot Sum)
- 8270
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5060
- Möbius Function
- 0
- Radical
- 506
- 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
- 143
- 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) = a(n-1) + a(n-9) for n >= 9; a(n) = 1 for n=0..7; a(8) = 2.at n=52A005711
- a(n) = n^3 - n^2.at n=23A045991
- Numbers n such that 83*2^n-1 is prime.at n=31A050567
- a(n) = n^2 * phi(n).at n=22A053191
- Number of divisors of n equals the average of distinct prime factors of n.at n=39A067547
- Numbers n such that sopf(sigma(n)) = sigma(sopf(n)), where sopf(x) = sum of the distinct prime factors of x.at n=27A076532
- a(n) = sigma_3(n) - sigma_2(n).at n=22A092349
- a(n) = binomial(n,3) - binomial(floor(n/2),3) - binomial(ceiling(n/2),3).at n=46A111384
- a(n) = n*(n+1)^2.at n=21A114364
- Number of 2 X 2 symmetric matrices over Z(n) having nonzero determinant.at n=22A115077
- Numbers m such that m^k does not divide the denominator of the m-th generalized harmonic number H(m,k) nor the denominator of the m-th alternating generalized harmonic number H'(m,k), for k = 2.at n=36A128672
- Numbers m such that m^k does not divide the denominator of the m-th generalized harmonic number H(m,k) nor the denominator of the m-th alternating generalized harmonic number H'(m,k), for k = 4.at n=31A128674
- Numbers m such that m^k does not divide the denominator of the m-th generalized harmonic number H(m,k) nor the denominator of the m-th alternating generalized harmonic number H'(m,k), for k = 6.at n=38A128676
- a(n) = p^2*(p-1), where p = prime(n).at n=8A135177
- Ulam's spiral (NNW spoke).at n=27A143860
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (-1, 1, 1), (1, 0, 0)}.at n=11A148055
- Numbers of the form n = r*s = (r+s)*t with gcd(r+s,t) = 1.at n=43A163188
- a(n) = A165966(n)/12.at n=18A166119
- Period of decimal representation of 1/n^3.at n=45A176921
- Period of decimal representation of 1/n^3.at n=22A176921