11646
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 25272
- Proper Divisor Sum (Aliquot Sum)
- 13626
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3876
- Möbius Function
- 0
- Radical
- 3882
- 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
- yes
- 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
- Stella octangula numbers: a(n) = n*(2*n^2 - 1).at n=18A007588
- a(n) = floor(binomial(2*n,n)/3^n).at n=41A024503
- Consider the Diophantine equation x^3 + y^3 = z^3 - 1 (x < y < z) or 'Fermat near misses'. The values of z (see A050787) are arranged in monotonically increasing order. Sequence gives values of y.at n=16A050789
- Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both prime.at n=16A085775
- Starting with 1, each number is the previous number plus the product of the index number and the sum of the digits of the previous number.at n=36A113904
- a(1) = 1; a(n+1) = round(sqrt(3)*a(n)).at n=17A134009
- a(n) = 36*n^2 - n.at n=17A157286
- a(n) = 1458*n - 18.at n=7A157508
- a(n) = 144*n^2 - 2*n.at n=8A158135
- a(n) = 324*n^2 - 18.at n=5A158589
- The number of 2 X 2 symmetric positive definite matrices whose entries are integers x,y,z satisfying x^2 + y^2 + z^2 <= n^2.at n=28A219744
- Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..1 array extended with zeros and convolved with 1,1,1.at n=22A222431
- The number of primes of the form i^2 + j^4 (A028916) <= 2^n.at n=22A226498
- Sum of all aliquot divisors of all positive integers <= prime(n).at n=42A244578
- Sum of the even parts of the partitions of n into 8 parts.at n=31A309632
- Sum of the next n nonnegative integers repeated (A004526).at n=35A319007
- Expansion of e.g.f. Product_{k>0} (1 + tan(x)^k / k).at n=7A335638
- Moran numbers whose arithmetic derivative is also a Moran number (A001101).at n=15A349485