2686
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4320
- Proper Divisor Sum (Aliquot Sum)
- 1634
- 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
- 1248
- Möbius Function
- -1
- Radical
- 2686
- Omega Function (Ω)
- 3
- 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
- 97
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Coordination sequence T3 for Zeolite Code LIO.at n=36A008131
- Coordination sequence T1 for Zeolite Code MFI.at n=33A008161
- Coordination sequence T3 for Zeolite Code MFS.at n=32A008175
- Coordination sequence T6 for Zeolite Code NES.at n=33A008210
- Coordination sequence T2 for Zeolite Code -CHI.at n=33A009847
- Numbers k such that sigma(k) = sigma(k+12).at n=25A015882
- Coordination sequence T3 for Zeolite Code OSI.at n=34A016432
- Numbers k such that the continued fraction for sqrt(k) has period 36.at n=30A020375
- Number of forests in Moebius ladder M_n.at n=4A020865
- a(n+1) = a(n) converted to base 10 from base 9 (written in base 10).at n=41A023392
- 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 50.at n=16A031548
- Decimal part of cube root of n starts with 9: first term of runs.at n=12A034135
- Number of partitions of n into parts not of the form 25k, 25k+6 or 25k-6. Also number of partitions with at most 5 parts of size 1 and differences between parts at distance 11 are greater than 1.at n=27A036005
- Numbers whose base-7 representation contains exactly three 5's.at n=24A043415
- Numbers n such that string 1,4 occurs in the base 9 representation of n but not of n-1.at n=37A044264
- Numbers n such that string 8,6 occurs in the base 10 representation of n but not of n-1.at n=28A044418
- Numbers k such that string 1,4 occurs in the base 9 representation of k but not of k+1.at n=37A044645
- Numbers n such that string 8,6 occurs in the base 10 representation of n but not of n+1.at n=28A044799
- Numbers whose base-4 representation contains exactly three 2's and two 3's.at n=37A045150
- Distinct even numbers in writing first numerator and then denominator of each element of the 1/4-Pascal triangle (by row).at n=14A046589