3647
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4176
- Proper Divisor Sum (Aliquot Sum)
- 529
- 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
- 3120
- Möbius Function
- 1
- Radical
- 3647
- 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
- 162
- 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 3-edge-connected rooted cubic maps with 2n nodes and a distinguished Hamiltonian cycle.at n=6A000264
- Numbers that are the sum of 7 positive 6th powers.at n=30A003363
- a(n) = floor(n*phi^13), where phi is the golden ratio, A001622.at n=7A004928
- a(n) = round(n*phi^13), where phi is the golden ratio, A001622.at n=7A004948
- Coordination sequence T2 for Zeolite Code DDR.at n=38A008072
- Coordination sequence T1 for Zeolite Code EAB.at n=44A008082
- Coordination sequence T1 for Zeolite Code ERI and OFF.at n=44A008093
- Coordination sequence T1 for Zeolite Code LOV.at n=40A008134
- a(0) = 1, a(n) = 5*n^2 + 2 for n>0.at n=27A010001
- exp(arctanh(x)+sin(x))=1+2*x+4/2!*x^2+9/3!*x^3+24/4!*x^4+97/5!*x^5...at n=7A013168
- Expansion of 1/(1-x^4-x^5-x^6-x^7-x^8-x^9-x^10-x^11-x^12).at n=32A017834
- a(n) = (d(n)-r(n))/2, where d = A026049 and r is the periodic sequence with fundamental period (1,0,0,1).at n=23A026050
- a(n) = Sum_{k=0..floor(n/2)} T(n-k, k), T given by A026692.at n=16A026702
- T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A027144.at n=10A027152
- 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 59.at n=16A031557
- Numbers having three 7's in base 8.at n=7A043451
- Numbers whose base-4 representation contains exactly one 0 and four 3's.at n=26A045070
- Numbers whose base-4 representation contains no 1's and exactly four 3's.at n=28A045113
- Numbers whose base-4 representation contains exactly one 2 and four 3's.at n=28A045142
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 20.at n=27A051985