4454
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 7128
- Proper Divisor Sum (Aliquot Sum)
- 2674
- 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
- 2080
- Möbius Function
- -1
- Radical
- 4454
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 139
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence T2 for Zeolite Code AHT.at n=45A009867
- Coordination sequence T3 for Zeolite Code RUT.at n=44A009899
- Expansion of 1/(1-x^10-x^11-x^12-x^13-x^14-x^15-x^16-x^17-x^18-x^19-x^20).at n=65A017896
- 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 66.at n=8A031564
- Every run of digits of n in base 16 has length 2.at n=20A033014
- Numbers whose base-16 expansion has no run of digits with length < 2.at n=36A033029
- Numbers having three 4's in base 10.at n=21A043507
- Positive integers having more base-16 runs of even length than odd.at n=21A044842
- Numbers whose base-3 representation contains exactly three 0's and no 1's.at n=35A044980
- Numbers whose base-4 representation contains exactly four 1's and two 2's.at n=16A045107
- Numbers k such that 267*2^k-1 is prime.at n=32A050892
- McKay-Thompson series of class 27b for the Monster group.at n=25A058601
- Nonprimes m such that phi(m)*sigma(m) is divisible by m+1.at n=31A065148
- Four-digit numbers that do not resolve to 6174 under the Kaprekar map (see A151949).at n=33A069746
- Smallest number a(n)>a(n-1) such that T(a(n-1))+T(a(n))=T(m) for some m, a(1)=3; T(i) are the triangular numbers.at n=19A072522
- a(1) = 4, a(n+1) is the smallest composite number > a(n) such that all of the differences a(n+1)-a(n) are distinct primes.at n=47A073679
- Sum of terms in n-th rows of triangle in A077159.at n=19A077162
- Row sums of A081964.at n=19A081966
- Positions where values change in A100144.at n=36A100250
- Expansion of (x+2) / ((x+1)*(x^2-3*x+1)).at n=8A102714