1345
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1620
- Proper Divisor Sum (Aliquot Sum)
- 275
- 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
- 1072
- Möbius Function
- 1
- Radical
- 1345
- 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
- 114
- 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
- Numbers m such that Fibonacci(m) ends with m.at n=36A000350
- Number of partitions of n, with two kinds of 1, 2, 3 and 4.at n=13A000710
- Number of n-node trees of height at most 5.at n=11A001385
- a(n) = 8*a(n-2) - 9*a(n-4).at n=9A002536
- Number of nonequivalent dissections of an n-gon into 3 polygons by nonintersecting diagonals up to rotation and reflection.at n=28A003453
- RATS: Reverse Add Then Sort the digits applied to previous term, starting with 1.at n=8A004000
- Numbers k such that k, k+1 and k+2 have the same number of divisors.at n=27A005238
- Number of paths through an array.at n=2A006676
- Discriminants of totally real cubic fields.at n=35A006832
- Coordination sequence T4 for Zeolite Code BOG.at n=26A008052
- Coordination sequence T2 for Zeolite Code BRE.at n=24A008059
- Coordination sequence T4 for Zeolite Code DAC.at n=23A008070
- Coordination sequence T2 for Zeolite Code NON.at n=22A008213
- Table T(n,k) giving number of permutations of [1..n] with order dividing k, read by antidiagonals.at n=70A008307
- Primitive parts of Pell numbers.at n=14A008555
- Expansion of e.g.f.: tan(x)*exp(tanh(x)).at n=9A009738
- Expansion of tanh(x)*cos(tan(x)).at n=4A009826
- Coordination sequence T3 for Zeolite Code -PAR.at n=26A009857
- Coordination sequence T3 for Zeolite Code RTE.at n=25A009892
- exp(arctan(arctanh(x)))=1+x+1/2!*x^2+1/3!*x^3+1/4!*x^4+9/5!*x^5...at n=8A012231