2084
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3654
- Proper Divisor Sum (Aliquot Sum)
- 1570
- 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
- 1040
- Möbius Function
- 0
- Radical
- 1042
- Omega Function (Ω)
- 3
- 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
- 125
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- a(n) = floor(n*phi^13), where phi is the golden ratio, A001622.at n=4A004928
- a(n) = round(n*phi^13), where phi is the golden ratio, A001622.at n=4A004948
- From the graph reconstruction problem.at n=7A006654
- Coordination sequence T1 for Zeolite Code MON.at n=28A008181
- Coordination sequence T4 for Zeolite Code STI.at n=31A008237
- Coordination sequence T1 for Cordierite.at n=27A008251
- Coordination sequence for alpha-Mn, Position Mn3.at n=12A009952
- Phi(n) + 5 | sigma(n + 5).at n=27A015784
- Numbers k such that phi(k) + 10 | sigma(k + 10).at n=46A015789
- Numbers k such that the continued fraction for sqrt(k) has period 38.at n=14A020377
- n-th composite is sum of first k composites for some k.at n=44A020642
- Least k such that b(k) = n, where b( ) is sequence A020944.at n=51A020948
- Place where n-th 1 occurs in A023119.at n=39A022781
- Coordination sequence T8 for Zeolite Code MWW.at n=30A024993
- Even numbers k such that in k^2 the parity of digits alternates.at n=31A030157
- Positions of records in A030717.at n=46A030722
- 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 22.at n=32A031520
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 18 ones.at n=36A031786
- Numbers having three 4's in base 8.at n=4A043439
- Numbers k such that string 3,5 occurs in the base 7 representation of k but not of k-1.at n=48A044164