4618
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6930
- Proper Divisor Sum (Aliquot Sum)
- 2312
- 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
- 2308
- Möbius Function
- 1
- Radical
- 4618
- 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
- 33
- 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
- Expansion of (1+x)(1+x^2)/(1-x-x^3).at n=21A003410
- Coordination sequence T1 for Zeolite Code CZP.at n=44A019456
- Numbers k such that the continued fraction for sqrt(k) has period 47.at n=9A020386
- a(1) = 3; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.at n=30A025000
- a(n) = least 2k such that p is the least prime in a Goldbach partition of 2k, where p = prime(n).at n=19A025017
- Number of partitions of n into parts not of the form 15k, 15k+4 or 15k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 6 are greater than 1.at n=32A035958
- Coordination sequence T2 for Zeolite Code STT.at n=45A038423
- Numbers whose base-4 representation contains exactly three 0's and three 2's.at n=14A045055
- Expansion of (1 - x^2)/(1 - x - x^3).at n=25A058278
- Number of "rooted index-functional forests" (Riffs) on n nodes. Number of "rooted odd trees with only exponent symmetries" (Rotes) on 2n+1 nodes.at n=8A061396
- a(n) = floor(Pi^n mod n^Pi).at n=14A066434
- Least number beginning with n such that every partial sum is a prime.at n=45A095157
- a(n) = Sum_{k=0..n} C(n-k, floor(k/2)).at n=22A097333
- a(0) = 1, a(1) = 2, a(2) = 5; for n >= 3, a(n) = a(n-1) + 2*a(n-2) + a(n-3).at n=11A101399
- Records in A105822.at n=42A104664
- Expansion of 1 / Product_{n>=0} (1-q^(5n+1))(1-q^(5n+2))(1-q^(5n+3)).at n=39A107234
- Semiprimes with prime sum of decimal digits and prime sum of prime factors.at n=40A108610
- Number of ways to place 5 nonattacking queens on an n X n board.at n=2A108792
- a(n) = a(n-3) + 2*a(n-6) + a(n-9).at n=33A109533
- Number of partitions of n with no even parts repeated and with no 1's.at n=47A117275