4778
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7170
- Proper Divisor Sum (Aliquot Sum)
- 2392
- 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
- 2388
- Möbius Function
- 1
- Radical
- 4778
- 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
- 28
- 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
- Coordination sequence T1 for Zeolite Code EPI.at n=44A008090
- Coordination sequence T4 for Zeolite Code GOO.at n=47A008114
- Coordination sequence T2 for Zeolite Code -CHI.at n=44A009847
- Numbers k such that the continued fraction for sqrt(k) has period 3.at n=17A013643
- A B_2 sequence: a(n) is the least value such that sequence increases and pairwise sums of elements are all distinct.at n=48A025582
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 8.at n=5A031421
- Least term in period of continued fraction for sqrt(n) is 8.at n=18A031432
- Numbers whose base-2 representation has exactly 12 runs.at n=1A043579
- a(n) = (1/2)*(n-th number whose base-2 representation has exactly 12 runs).at n=18A043686
- Numbers k such that (5^k + k)/3 is prime.at n=3A058045
- Triangle read by rows: this is a variant of A008280 in which 2 rows go from left to right, 2 from right to left, 2 from left to right, etc.at n=61A058257
- a(n) = floor(Pi*n^2).at n=39A066643
- Smallest of four consecutive integers divisible by four consecutive primes respectively.at n=28A072555
- a(n) is the sum of the n-th row of the triangle formed by replacing each m in Pascal's triangle with sigma(m).at n=11A074801
- a(n) = Pi * n^2 rounded off.at n=39A075726
- Expansion of (1-x)^(-1)/(1+2*x^2+x^3).at n=28A077894
- Numbers k such that A081252(m)/m^2 has a local minimum for m = k.at n=11A081253
- Sum of first n 4-almost primes.at n=33A086046
- Terms in a specific cycle of length 29 of the map x->A098189(x).at n=14A098192
- Semiprimes a such that there exist three semiprimes b, c and d with a^3=b^3+c^3+d^3.at n=29A113490