2619
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
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3920
- Proper Divisor Sum (Aliquot Sum)
- 1301
- 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
- 1728
- Möbius Function
- 0
- Radical
- 291
- Omega Function (Ω)
- 4
- 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
- 102
- 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 degree-n permutations of order exactly 2.at n=8A001189
- Expansion of (1+x^3)/((1-x)*(1-x^2)^2*(1-x^3)).at n=43A001973
- Number of Young tableaux of height <= 8.at n=9A007580
- Coordination sequence T1 for Zeolite Code AST.at n=38A008036
- Coordination sequence T5 for Zeolite Code MTW.at n=34A008200
- Coordination sequence T4 for Zeolite Code CON.at n=36A009871
- Square root of A030693.at n=18A030694
- 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 51.at n=1A031549
- Number of partitions of n with equal nonzero number of parts congruent to each of 2 and 3 (mod 4).at n=37A035551
- Coordination sequence T3 for Zeolite Code ESV.at n=34A038412
- Coordination sequence T9 for Zeolite Code STT.at n=34A038424
- Gaps of 8 in sequence A038593 (upper terms).at n=3A038656
- Divisible by 3 (and 9) and are differences between two cubes in at least one way.at n=27A038851
- Numbers ending with '9' that are the difference of two positive cubes.at n=13A038864
- Numerators of continued fraction convergents to sqrt(382).at n=4A041724
- Numbers k such that the string 3,0 occurs in the base 9 representation of k but not of k-1.at n=36A044278
- Numbers k such that the string 5,3 occurs in the base 9 representation of k but not of k-1.at n=35A044299
- Numbers k such that string 1,9 occurs in the base 10 representation of k but not of k-1.at n=29A044351
- Numbers n such that string 3,0 occurs in the base 9 representation of n but not of n+1.at n=36A044659
- Numbers n such that string 1,9 occurs in the base 10 representation of n but not of n+1.at n=29A044732