1660
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 3528
- Proper Divisor Sum (Aliquot Sum)
- 1868
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 656
- Möbius Function
- 0
- Radical
- 830
- Omega Function (Ω)
- 4
- 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
- 135
- 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
- yes
- Odd
- no
Appears in sequences
- Differences of reciprocals of unity.at n=2A000424
- Differences of reciprocals of unity.at n=2A001241
- Number of Hamiltonian paths in C_5 X P_n.at n=2A003732
- a(n) = n*(5*n^2 - 2)/3.at n=10A004466
- Coordination sequence T1 for Zeolite Code ABW and ATN.at n=28A008000
- Coordination sequence T1 for Zeolite Code ATV.at n=26A008043
- Coordination sequence T6 for Zeolite Code MEL.at n=26A008155
- Coordination sequence T1 for Moganite.at n=26A008258
- Triangle read by rows of differences of reciprocals of unity.at n=12A008969
- Coefficients in expansion of Pi as Sum_{n>=1} a(n)/(n*n!*(n+1)!), as found by greedy algorithm.at n=49A011191
- Number of lines through exactly 8 points of an n X n grid of points.at n=47A018815
- Numbers k such that the continued fraction for sqrt(k) has period 36.at n=12A020375
- Minimum number of possible solutions for all irreducible stick-cutting problems.at n=13A022542
- a(n) = A027113(n, n+3).at n=7A027116
- a(n) = A027113(n, 2n-7).at n=6A027125
- 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 20.at n=25A031518
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 18 ones.at n=22A031786
- Number of rooted compound windmills with n nodes and leaves of 2 colors.at n=7A032201
- Every run of digits of n in base 9 has length 2.at n=19A033007
- Numbers whose base-9 expansion has no run of digits with length < 2.at n=29A033022