4818
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 10656
- Proper Divisor Sum (Aliquot Sum)
- 5838
- 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
- 1440
- Möbius Function
- 1
- Radical
- 4818
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- 121
- 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
- yes
- Odd
- no
Appears in sequences
- MacMahon's generalized sum of divisors function.at n=16A002128
- Number of (unordered, unlabeled) rooted trimmed trees with n nodes.at n=13A002955
- Coordination sequence T2 for Zeolite Code EUO.at n=43A008097
- Coordination sequence for quartz.at n=39A008261
- Aliquot sequence starting at 966.at n=5A014363
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = (primes).at n=19A025117
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 68.at n=13A031566
- Dirichlet convolution of triangular numbers with themselves.at n=43A034715
- Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 2 (mod 5).at n=41A035563
- Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 4 (mod 5).at n=40A035565
- Number of partitions of n such that cn(0,5) = cn(2,5) <= cn(3,5) = cn(4,5) <= cn(1,5).at n=53A036846
- Positive numbers having the same set of digits in base 5 and base 8.at n=34A037431
- Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,2,3.at n=6A037674
- Numbers whose base-5 representation contains exactly two 2's and three 3's.at n=11A045273
- Numbers n such that 243*2^n-1 is prime.at n=31A050880
- Numbers k such that k^4 == 1 (mod 5^4).at n=30A056091
- Numbers which are the sum of their proper divisors containing the digit 0.at n=19A059461
- Geometric mean of the digits = 4. In other words, the product of the digits is = 4^k where k is the number of digits.at n=29A061428
- When squared gives number composed just of the digits 1, 2, 3, 4.at n=22A061677
- Write 0,1,2,3,4,... in a triangular spiral; then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0,2,...at n=33A062708