7449
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 10752
- Proper Divisor Sum (Aliquot Sum)
- 3303
- 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
- 4560
- Möbius Function
- -1
- Radical
- 7449
- Omega Function (Ω)
- 3
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 114
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Pseudoprimes to base 5.at n=15A005936
- Pseudoprimes to base 14.at n=27A020142
- Pseudoprimes to base 31.at n=31A020159
- Pseudoprimes to base 38.at n=39A020166
- Pseudoprimes to base 70.at n=32A020198
- Strong pseudoprimes to base 38.at n=13A020264
- 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 56.at n=39A031554
- Numbers k such that 203*2^k + 1 is prime.at n=16A032478
- a(n) = (2*n+1)*(10*n+1).at n=19A033574
- Numbers whose base-5 representation contains exactly two 2's and three 4's.at n=25A045288
- 12-gonal (or dodecagonal) numbers: a(n) = n*(5*n-4).at n=39A051624
- a(n) = (2*n-1)*(n^2 -n +2)/2.at n=19A063488
- Numbers k such that sigma(prime(k) + 1) == 0 (mod k).at n=36A067759
- a(n) = Sum_{d|n} d*tau(d)^2.at n=47A068984
- Numbers n such that when the digits of Fibonacci(n) are sorted into decreasing order and zeros are dropped it is a prime.at n=46A082922
- a(n)=A089551(n)/2.at n=39A089558
- Starting numbers for which the RATS sequence has eventual period 14.at n=5A114615
- Start with 34 and repeatedly reverse the digits and add 16 to get the next term.at n=14A119454
- Nonprimes n such that 5^n==5 (mod n).at n=29A122782
- Expansion of q / (chi(-q) * chi(-q^11))^2 in powers of q where chi() is a Ramanujan theta function.at n=26A123631