3609
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 5226
- Proper Divisor Sum (Aliquot Sum)
- 1617
- 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
- 2400
- Möbius Function
- 0
- Radical
- 1203
- Omega Function (Ω)
- 3
- 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
- 43
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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 multigraphs with 4 nodes and n edges.at n=22A003082
- Numerators of worst case for Engel expansion.at n=28A006539
- Coordination sequence T2 for Zeolite Code MFI.at n=38A008165
- Pseudoprimes to base 98.at n=32A020226
- Numbers k such that Fibonacci(k) == 34 (mod k).at n=30A023180
- "DHK" (bracelet, identity, unlabeled) transform of 1,1,1,1,...at n=17A032245
- Exactly 5 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a prime.at n=31A032695
- Denominators of continued fraction convergents to sqrt(331).at n=8A041625
- a(n)=(s(n)+1)/8, where s(n)=n-th base 8 palindrome that starts with 7.at n=21A043071
- Numbers k such that the string 0,9 occurs in the base 10 representation of k but not of k-1.at n=38A044341
- Pinwheel numbers: a(n) = 2*n^2 + 6*n + 1.at n=41A059993
- Sum of distinct orders of degree-n permutations.at n=19A060179
- Sum of first n semiprimes.at n=48A062198
- Numbers whose decimal representations consist of nested and /or concatenated ordered pairs 0-9, 1-8, 2-7, 3-6 and 4-5.at n=29A065751
- Numbers n such that both n^4 + 2 and n^4 - 2 are prime.at n=20A071351
- a(0)=1, then the fractional part of Pi*a(n) decreases monotonically to zero.at n=46A079043
- Numbers k such that (83*10^(k-1) + 61)/9 is a depression prime.at n=4A082718
- Number of nonisomorphic groups with orders indexed by least prime signatures.at n=43A098887
- Numbers k such that 7*10^k + 2*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=13A103054
- Numbers k such that (k + prime(k)) and (k+1 + prime(k+1)) are divisible by 11.at n=31A107380