2095
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2520
- Proper Divisor Sum (Aliquot Sum)
- 425
- 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
- 1672
- Möbius Function
- 1
- Radical
- 2095
- 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
- 107
- 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
- Number of n-node unlabeled connected graphs with one cycle of length 3.at n=9A000226
- Number of nonnegative solutions to x^2 + y^2 <= n^2.at n=51A000603
- Coordination sequence T1 for Zeolite Code ATS.at n=33A008038
- Coordination sequence T1 for Zeolite Code RSN.at n=30A009885
- Numbers k such that the continued fraction for sqrt(k) has period 44.at n=14A020383
- a(n) = [ a(n-1)/a(1) ] + [ a(n-1)/a(2) ] + ... + [ a(n-1)/a(n-1) ] for n >= 3, with initial terms 1,2.at n=11A022862
- Expansion of e.g.f. cosh(exp(x)-1).at n=8A024430
- Sum of remainders of n mod prime(k), for k = 1,2,3,...,n.at n=52A024925
- [ Sum (s(j) - s(i))^2 ], 1 <= i < j <= n, where s(k) = 1 + 1/2 + ... + 1/k.at n=53A025216
- Cube root of A030683.at n=18A030684
- Numbers having period-3 7-digitized sequences.at n=36A031203
- 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 18.at n=41A031516
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 20 ones.at n=28A031788
- Lucky numbers with size of gaps equal to 10 (upper terms).at n=22A031893
- Lucky numbers with size of gaps equal to 18 (lower terms).at n=13A031900
- "EFK" (unordered, size, unlabeled) transform of 2,1,1,1,...at n=42A032303
- Rooted tree triangle read by rows: a(n,k) = number of forests with n nodes and k rooted trees.at n=68A033185
- a(n) = Sum_{ k, k|n } 2^(k-1).at n=11A034729
- Numbers whose maximal base-9 run length is 3.at n=38A037998
- Numerators of continued fraction convergents to sqrt(457).at n=6A041870