12605
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15132
- Proper Divisor Sum (Aliquot Sum)
- 2527
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10080
- Möbius Function
- 1
- Radical
- 12605
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
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
- 63
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- no
- Odd
- yes
Appears in sequences
- Base-7 palindromes that start with 5.at n=28A043019
- Number of wide partitions of n.at n=48A070830
- a(n) = (3*7^n+(-1)^n)/4.at n=5A083232
- Imaginary part of absolute Gaussian perfect numbers, in order of increasing magnitude.at n=23A102532
- The number of elements in S_4\det^{-1}(n)/GL(4,Z), where we take det : M_{4 X 4} (Z) => Z.at n=47A162159
- Base-6 analog of A208059.at n=42A212995
- Number of superdiagonal partitions: partitions (p1, p2, p3, ...) of n such that pi >= i.at n=48A238873
- Number of inequivalent (mod D_3) ways to place 3 points on a triangular grid of side n so that they are not vertices of an equilateral triangle of any orientation.at n=10A243142
- Expansion of 1/(1 - x - x^2/(1 + x^2/(1 + x^3/(1 + x^4/(1 + x^5/(1 + ...)))))), a continued fraction.at n=24A302016
- a(n) = 836*2^n - 771.at n=4A305264
- a(n) = sum of the first n primes whose distance to next prime is 4.at n=34A360226
- Number of subsets of {1..n} whose cardinality is equal to the sum of some subset.at n=14A367216
- Indices where the cumulative sum of cos(2k+1)^(2k+1) reaches a record low value.at n=36A389560
- a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangle of side n units having three vertices of a trapezoid inside the triangle.at n=56A391039