3287
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3480
- Proper Divisor Sum (Aliquot Sum)
- 193
- 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
- 3096
- Möbius Function
- 1
- Radical
- 3287
- 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
- 74
- 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
- N-equivalence classes of threshold functions of n or fewer variables.at n=5A002078
- Coordination sequence T1 for Zeolite Code APD.at n=38A008034
- a(n) = (d(n)-r(n))/5, where d = A026043 and r is the periodic sequence with fundamental period (0,2,3,0,0).at n=33A026045
- a(n) = (d(n)-r(n))/5, where d = A026060 and r is the periodic sequence with fundamental period (0,0,1,4,0).at n=37A026062
- Number of days in n years (n=4 is the first leap year).at n=8A033171
- Number of days in n years (n=3 is the first leap year).at n=8A033172
- Number of days in n years (n=2 is the first leap year).at n=8A033173
- Number of partitions of n with equal number of parts congruent to each of 0, 1 and 3 (mod 5).at n=50A035573
- Coordination sequence T2 for Zeolite Code SFF.at n=38A038438
- Numbers k such that the string 5,2 occurs in the base 9 representation of k but not of k-1.at n=44A044298
- Numbers n such that string 8,7 occurs in the base 10 representation of n but not of n-1.at n=35A044419
- Numbers k such that string 8,7 occurs in the base 10 representation of k but not of k+1.at n=35A044800
- Numbers whose base-5 representation contains exactly three 1's and two 2's.at n=10A045231
- a(1) = 4; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=30A046254
- Largest number m with A046805(m) = n.at n=35A046806
- Values of k for which A075059(k) = A003418(k) + 1 is prime.at n=74A049537
- Number of partitions of n with parts (with repetitions) forming a division lattice (i.e., closed under GCD and LCM).at n=47A051839
- Coordination sequence T5 for Zeolite Code SFE.at n=38A057321
- Numbers k such that phi(k) = sigma(k+1) - sigma(k-1).at n=12A066155
- Numbers k such that k and 3^k end with the same two digits.at n=32A067749