4868
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
- 6
- Divisor Sum
- 8526
- Proper Divisor Sum (Aliquot Sum)
- 3658
- 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
- 2432
- Möbius Function
- 0
- Radical
- 2434
- 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
- 134
- 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
- Generalized sum of divisors function.at n=46A002132
- Coordination sequence T1 for Zeolite Code AEL.at n=46A008004
- a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.at n=5A026983
- a(n) = C(n+2,3) + 2*C(n,2) + 2*(n-2).at n=27A034857
- Trajectory of 3 under map n->15n+1 if n odd, n->n/2 if n even.at n=9A037105
- Numbers whose base-3 representation contains exactly four 0's and no 1's.at n=31A044985
- Numbers whose base-3 representation contains exactly four 0's and four 2's.at n=10A045013
- Numbers k such that k and k+1 both have 6 divisors.at n=47A049103
- Harmonic mean of digits is 6.at n=8A062184
- Number of inequivalent (ordered) solutions to n^2 = sum of 7 squares of integers >= 0.at n=39A065461
- Smaller of two consecutive numbers of the form p^2*q where p and q are distinct primes.at n=45A074172
- "The partial sums of the positions where T occurs in this sentence are one, eight, twentyfive, fortynine, eightythree, onehundredtwentysix, ..." (Variation of Aronson's sequence).at n=31A089613
- Indices of terms in the sequence 3, 1, 4, 5, 9, 14, 23, ... (A000285 prefixed with 3) which are prime numbers.at n=36A091158
- Row 3 of array in A114999.at n=45A115007
- Sums of rows of the triangle in A116366.at n=28A116367
- a(n) = Sum {j=1..n} j*A001462(j).at n=33A143125
- a(n) = ((8 + sqrt(2))^n + (8 - sqrt(2))^n)/2.at n=4A147959
- a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=2,a(2)=9.at n=24A154495
- Number of line segments connecting exactly 8 points in an n x n grid of points.at n=28A177724
- Conjectured positive numbers which have more than one representation (m,s) as a difference s^2 - m^5, m >= 1, s > 0.at n=21A177770