2258
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3390
- Proper Divisor Sum (Aliquot Sum)
- 1132
- 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
- 1128
- Möbius Function
- 1
- Radical
- 2258
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 37
- 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
- Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.at n=33A001836
- Numbers that are the sum of 11 positive 6th powers.at n=34A003367
- Number of (undirected) Hamiltonian paths in the n-ladder graph K_2 X P_n.at n=47A003682
- Coordination sequence T6 for Zeolite Code BOG.at n=34A008054
- Coordination sequence T3 for Zeolite Code MTT.at n=29A008191
- Numbers k such that C(k,3) = C(x,3) + C(y,3) is solvable.at n=49A010330
- Numbers k such that the continued fraction for sqrt(k) has period 7.at n=20A010338
- a(n) = n^2 + n + 2.at n=47A014206
- Expansion of 1/(1-x^5-x^6-x^7-x^8-x^9-x^10-x^11-x^12-x^13).at n=36A017844
- Numbers whose least quadratic nonresidue (A020649) is 11.at n=12A025024
- a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026769.at n=4A027242
- Coordination sequence T4 for Zeolite Code CGS.at n=35A027368
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 13.at n=2A031601
- a(n) = a(n-1) + a(round(2*(n-1)/3)) + a(round((n-1)/3)) with a(1)=1, a(2)=2.at n=23A033500
- Denominators of continued fraction convergents to sqrt(661).at n=7A042271
- Numbers n such that string 2,2 occurs in the base 8 representation of n but not of n-1.at n=35A044205
- Numbers n such that the string 7,8 occurs in the base 9 representation of n but not of n-1.at n=27A044322
- Numbers n such that string 5,8 occurs in the base 10 representation of n but not of n-1.at n=24A044390
- Numbers n such that string 2,2 occurs in the base 8 representation of n but not of n+1.at n=35A044586
- Numbers n such that string 0,7 occurs in the base 9 representation of n but not of n+1.at n=29A044639