4745
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 6216
- Proper Divisor Sum (Aliquot Sum)
- 1471
- 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
- 3456
- Möbius Function
- -1
- Radical
- 4745
- 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
- 51
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = Sum_{k = 1..n} floor(2^k / k).at n=14A000801
- a(n) = floor((7*2^(n+1)-9*n-10)/3).at n=10A005262
- Integers that are squarefree and also the sum of first k squarefrees for some k.at n=45A013932
- Pseudoprimes to base 27.at n=33A020155
- Pseudoprimes to base 51.at n=21A020179
- Pseudoprimes to base 83.at n=41A020211
- Numbers k such that the continued fraction for sqrt(k) has period 13.at n=29A020352
- Triangle of Gaussian binomial coefficients [ n,k ] for q = 8.at n=12A022172
- Gaussian binomial coefficients [ n,2 ] for q = 8.at n=2A022242
- Numbers that are the sum of 2 nonzero squares in exactly 4 ways.at n=20A025287
- Numbers that are the sum of 2 nonzero squares in 4 or more ways.at n=20A025295
- Numbers that are the sum of 2 distinct nonzero squares in exactly 4 ways.at n=20A025305
- Numbers that are the sum of 2 distinct nonzero squares in 4 or more ways.at n=20A025314
- Numbers whose set of base-8 digits is {1,2}.at n=34A032929
- Base 8 digits are, in order, the first n terms of the periodic sequence with initial period 1,1,2.at n=4A037533
- Base-8 palindromes that start with 1.at n=28A043021
- Numbers having four 1's in base 8.at n=17A043428
- a(n) = n!*Sum_{k=0..n/2} n^(2k)/(2k)!.at n=5A046707
- Sum of consecutive nonsquares.at n=13A048395
- Number of tilings of 4 X 3n rectangle by 1 X 3 rectangles. Rotations and reflections are considered distinct tilings.at n=6A049086