12654
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
- 2
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 29640
- Proper Divisor Sum (Aliquot Sum)
- 16986
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3888
- Möbius Function
- 0
- Radical
- 4218
- Omega Function (Ω)
- 5
- Little Omega Function (ω)
- 4
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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 55
- 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) = (5*n+1)*(5*n+4).at n=22A001545
- G.f.: 2*(1-x^3)/((1-x)^5*(1+x)^2).at n=35A005996
- a(n) = floor(n*(n-1)*(n-2)/4).at n=38A011886
- Positive numbers k such that k and 2*k are anagrams in base 7 (written in base 7).at n=5A023068
- Positive numbers k such that k and 3*k are anagrams in base 7 (written in base 7).at n=17A023069
- Positive numbers k such that k and 4*k are anagrams in base 7 (written in base 7).at n=11A023070
- Base-5 palindromes that start with 4.at n=38A043009
- Base-7 palindromes that start with 5.at n=29A043019
- First partial sums of A048745; second partial sums of A048654.at n=9A048778
- Smallest area of a Pythagorean triangle with n as length of a leg.at n=34A054436
- a(n) = n*(n+1)*(2*n+1).at n=18A055112
- Largest area of a Pythagorean triangle with n as length of one of the three sides (in fact as a leg).at n=34A055522
- a(n) = 18*(n - 2)*(2*n - 5).at n=19A060787
- Numbers k such that iterating phi(sigma(k)-phi(k)) starting from k leads to the fixed point 8064.at n=21A077096
- Number of permutations satisfying -k <= p(i) - i <= r and p(i) - i not in I, i=1..n, with k=1, r=5, I={2,3}.at n=18A079960
- Fourth column (m=3) of (1,6)-Pascal triangle A096956.at n=36A096957
- Numbers n such that pi(n) = sigma(d_1)*sigma(d_2)*...*sigma(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.at n=5A098685
- 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=38A113904
- Numbers k for which digitsum(k) + digitsum(k^2) + digitsum(k^3) = digitsum(k^4).at n=29A118470
- Coefficient of x^2 in the polynomial (x-p(n))*(x-p(n+1))*(x-p(n+2))*(x-p(n+3)), where p(k) is the k-th prime.at n=12A127348