4449
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5936
- Proper Divisor Sum (Aliquot Sum)
- 1487
- 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
- 2964
- Möbius Function
- 1
- Radical
- 4449
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 69
- 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 positive integers <= 2^n of the form 3*x^2 + 4*y^2.at n=15A000049
- Numbers k such that k^4 can be written as a sum of four positive 4th powers.at n=25A003294
- Coordination sequence T1 for Zeolite Code DOH.at n=41A008078
- Coordination sequence T3 for Zeolite Code RSN.at n=44A009887
- Pisot sequence T(4,13), a(n) = floor(a(n-1)^2/a(n-2)).at n=6A010919
- Numbers k such that the continued fraction for sqrt(k) has period 90.at n=2A020429
- a(n) = 3*a(n-1) + a(n-2) - a(n-3) - a(n-5).at n=6A022029
- 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 44.at n=21A031542
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 42 ones.at n=14A031810
- Exactly 5 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a prime.at n=38A032695
- Numbers k such that k^4 can be written as a sum of four positive 4th powers with no common factor.at n=9A039664
- Numbers having four 3's in base 6.at n=5A043384
- Numbers having three 4's in base 10.at n=20A043507
- Numbers whose base-4 representation contains exactly two 0's and four 1's.at n=32A045027
- Second differences of partition numbers A000041.at n=48A053445
- Number of even nontotients not exceeding 2^n.at n=13A072077
- Numbers k such that k^4 can be written as a sum of four distinct positive 4th powers.at n=25A096739
- Near-repdigit semiprimes with 4 as repeated digit.at n=7A105985
- Semiprimes with semiprime digits (digits 4, 6, 9 only).at n=15A107342
- Numbers with semiprime digits (digits 4, 6, 9 only).at n=41A107665