6318
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 15288
- Proper Divisor Sum (Aliquot Sum)
- 8970
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1944
- Möbius Function
- 0
- Radical
- 78
- Omega Function (Ω)
- 7
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 124
- 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) = (n^2 + 1)*3^n.at n=5A003486
- a(n) is nonsquarefree and is sum of first k nonsquarefrees for some k.at n=30A013935
- Generalized Pellian with 2nd term equal to 6.at n=9A048693
- Nearest integer to sqrt( n! ).at n=11A055227
- a(n) = ceiling(sqrt(n!)).at n=11A055228
- Engel expansion of 1/e = 0.367879... .at n=39A059193
- The start of a record-setting run of consecutive integers i with distinct A001222(i).at n=5A067665
- Engel expansion of sinh(1/3).at n=13A068380
- Generalized Catalan numbers 9*x*A(x)^2 -A(x) +1 -8*x=0.at n=4A068771
- Minimum x such that f(x)=n, where f(x)=A068796(x) is the maximum k such that k consecutive integers starting at x have distinct numbers of prime factors (counted with multiplicity).at n=6A068797
- Numbers n such that n*sigma(n) is a perfect square.at n=12A069070
- Numbers k such that the sum of the digits of k equals the sum of the prime divisors of k.at n=30A070275
- z such that the Diophantine equation x^3+y^4=z^3 has solutions.at n=42A070741
- Harshad numbers which terminate in their digital sum.at n=38A070938
- Binomial transform of n^2*2^n/2.at n=5A077616
- Triangle, read by rows, where the n-th row lists the (2n+1) coefficients of (1+2*x+3*x^2)^n.at n=46A084608
- Number of lattice points on or inside the rectangle formed by [1 <= x <= (q-1)/2] and [1 <= y <= (p-1)/2], where p = n-th prime, q = (n-1)-st prime.at n=35A087427
- a(1)=1, a(n) = n*a(floor(n/2)).at n=26A098844
- Positions where values change in A100144.at n=41A100250
- Number of distinct products i*j*k for 1 <= i <= j < k <= n.at n=47A100435