1622
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2436
- Proper Divisor Sum (Aliquot Sum)
- 814
- 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
- 810
- Möbius Function
- 1
- Radical
- 1622
- 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
- 135
- 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
- yes
- Odd
- no
Appears in sequences
- Number of non-Abelian metacyclic groups of order 2^n.at n=37A007982
- Coordination sequence T3 for Zeolite Code EUO.at n=25A008098
- Coordination sequence T4 for Zeolite Code EUO.at n=25A008099
- Coordination sequence T4 for Zeolite Code MOR.at n=26A008185
- Coordination sequence T2 for Zeolite Code SGT.at n=25A008230
- Coordination sequence T2 for feldspar.at n=27A008255
- Coordination sequence T3 for Zeolite Code VNI.at n=25A009909
- Coordination sequence for CaF2(2), F position.at n=18A009925
- a(0) = 1, a(n) = 5*n^2 + 2 for n>0.at n=18A010001
- a(0) = 1, a(n) = 20*n^2 + 2 for n>0.at n=9A010010
- Number of partitions of n into distinct parts, none being 2.at n=48A015744
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite BEA = Beta Na7[Al7Si57O128] starting with a T3 atom.at n=10A019069
- Numbers k such that the continued fraction for sqrt(k) has period 26.at n=34A020365
- n-th composite is sum of first k composites for some k.at n=39A020642
- Number of 5-balanced strings of length n: let d(S)= #(1)'s in S - #(0)'s, then S is k-balanced if every substring T has -k<=d(T)<=k; here k=5.at n=11A027560
- [ exp(13/16)*n! ].at n=5A030901
- 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 40.at n=2A031538
- Concatenation of n and n + 6 or {n,n+6}.at n=15A032611
- a(n) = floor(10000/sqrt(n)).at n=37A033433
- Number of partitions of n into parts 4k+2 and 4k+3 with at least one part of each type.at n=50A035626