3619
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4608
- Proper Divisor Sum (Aliquot Sum)
- 989
- 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
- 2760
- Möbius Function
- -1
- Radical
- 3619
- 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
- 56
- 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
- Number of strict 5th-order maximal independent sets in cycle graph.at n=46A007393
- Coordination sequence T2 for Zeolite Code VNI.at n=37A009908
- Coordination sequence T1 for Zeolite Code SAO.at n=47A019571
- a(n) = n*(15*n - 1)/2.at n=22A022272
- Sums of six consecutive squares: a(n) = n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 + (n+5)^2.at n=22A027865
- Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 7.at n=44A031410
- Numbers k such that 105*2^k+1 is prime.at n=31A032402
- Numbers whose set of base-15 digits is {1,4}.at n=15A032827
- a(n) = floor(T_(n+1)/T_(n)) where T_n is n-th tangential or "Zag" number (see A000182).at n=46A034972
- Expansion of e.g.f. exp((exp(p*x) - p - 1)/p + exp(x)) for p=4.at n=5A036074
- Coordination sequence T2 for Zeolite Code ESV.at n=40A038410
- Coordination sequence T4 for Zeolite Code ESV.at n=40A038411
- Coordination sequence T5 for Zeolite Code STT.at n=40A038415
- Denominators of continued fraction convergents to sqrt(969).at n=11A042875
- Internal digits of n^2 include digits of n, n does not end in 0.at n=37A046833
- Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-4)/2.at n=23A048070
- Expansion of 1 + x/(1 - 2*x - x^3 + x^4).at n=12A052908
- Positive numbers k such that, in base 3, 2^k and 2^(k+1) have the same number of digits and the same number of 0's.at n=45A056734
- a(n) = sum of modular offsets: mod[n+c,b]-(mod[n,b]+c) for c<=b<=n.at n=31A066809
- Pair the odd numbers such that the k-th pair is (r, r+2k) where r is the smallest odd number not included earlier: (1, 3), (5, 9), (7, 13), (11, 19), (15, 25), (17, 29), (21, 35), (23, 39), (27, 45), ... This is the sequence of the product of the members of pairs.at n=14A075320