2217
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2960
- Proper Divisor Sum (Aliquot Sum)
- 743
- 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
- 1476
- Möbius Function
- 1
- Radical
- 2217
- 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
- 76
- 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
- Number of alkyl benzenes with n carbon atoms: C(n)H(2n-6).at n=14A000639
- Numbers k such that k, k+1 and k+2 have the same number of divisors.at n=43A005238
- a(n) = Sum_{k=1..n} k*phi(k).at n=21A011755
- Numbers k such that the continued fraction for sqrt(k) has period 30.at n=28A020369
- Position of n^2 + 5 in A000408.at n=51A024801
- a(n) = sum of the numbers between the two n's in A026370.at n=24A026373
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 30.at n=23A031528
- a(n) = least integer m such that the part after the decimal point of the n-th root of m starts with the digit 5.at n=17A034082
- a(n)=number of Gaussian integers z=a+bi satisfying |z|<=n+1/2.at n=26A036704
- Coordination sequence T7 for Zeolite Code SFF.at n=31A038431
- Sums of 3 distinct powers of 3.at n=39A038465
- Smallest of three consecutive squarefree numbers k, k+1, k+2 of the form p*q where p and q are distinct primes.at n=26A039833
- Numbers having four 2's in base 4.at n=37A043344
- Numbers having three 3's in base 9.at n=3A043467
- Numbers whose base-13 representation has exactly 4 runs.at n=6A043659
- Numbers n such that string 5,1 occurs in the base 8 representation of n but not of n-1.at n=38A044228
- Numbers n such that string 3,3 occurs in the base 9 representation of n but not of n-1.at n=27A044281
- Numbers n such that string 1,7 occurs in the base 10 representation of n but not of n-1.at n=25A044349
- Numbers n such that string 5,1 occurs in the base 8 representation of n but not of n+1.at n=38A044609
- Numbers n such that string 3,3 occurs in the base 9 representation of n but not of n+1.at n=27A044662