2705
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
- 4
- Divisor Sum
- 3252
- Proper Divisor Sum (Aliquot Sum)
- 547
- 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
- 2160
- Möbius Function
- 1
- Radical
- 2705
- 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
- 40
- 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
- Numbers k such that 15*2^k - 1 is prime.at n=27A002237
- Numbers that are the sum of 11 positive 7th powers.at n=16A003378
- a(n) = floor(n*phi^10), where phi is the golden ratio, A001622.at n=22A004925
- Left diagonal of partition triangle A047812.at n=12A007044
- Coordination sequence T2 for Zeolite Code PAU.at n=38A008220
- Coordination sequence T1 for Banalsite.at n=31A008249
- Crystal ball sequence for D_8 lattice.at n=2A008362
- a(n) = floor( n*(n-1)*(n-2)/11 ).at n=32A011893
- Pseudoprimes to base 52.at n=14A020180
- Strong pseudoprimes to base 52.at n=4A020278
- (d(n)-r(n))/5, where d = A026066 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=31A026068
- a(n) = Sum_{d|n} phi(d)^2.at n=52A029939
- Integer part of decimal 'base-2 looking' numbers divided by their actual base-2 values (denominator of a(n) is n, numerator is n written in binary but read in decimal).at n=36A032532
- Number of partitions in parts not of the form 13k, 13k+1 or 13k-1. Also number of partitions with no part of size 1 and differences between parts at distance 5 are greater than 1.at n=36A035949
- Number of partitions satisfying cn(1,5) = cn(4,5) = 0.at n=48A036822
- Denominators of continued fraction convergents to sqrt(677).at n=2A042301
- Numerators of continued fraction convergents to sqrt(846).at n=6A042632
- Numbers whose base-3 representation has exactly 8 runs.at n=33A043588
- Numbers n such that number of runs in the base 3 representation of n is congruent to 0 mod 8.at n=33A043798
- Numbers n such that number of runs in the base 3 representation of n is congruent to 8 mod 9.at n=33A043814