4923
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
- 6
- Divisor Sum
- 7124
- Proper Divisor Sum (Aliquot Sum)
- 2201
- 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
- 3276
- Möbius Function
- 0
- Radical
- 1641
- 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
- 72
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) is the solution to the postage stamp problem with n denominations and 4 stamps.at n=22A001214
- Coordination sequence T4 for Zeolite Code HEU.at n=46A008119
- Numbers k such that Fib(k) == -34 (mod k).at n=30A023169
- 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 69.at n=15A031567
- Numbers k such that 75*2^k+1 is prime.at n=31A032387
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/10) starts with n.at n=34A034075
- Number of partitions satisfying cn(2,5) + cn(3,5) <= cn(0,5) + cn(1,5) + cn(4,5).at n=30A039867
- Numbers m such that the factorizations of m..m+3 have the same number of primes (including multiplicities).at n=17A045940
- Numbers k such that k and k+1 both have 6 divisors.at n=48A049103
- a(n)/n^2 is the minimal average squared Euclidean distance of n points to their center of gravity among all configurations of n points on the hexagonal lattice.at n=32A059518
- First of 3 consecutive numbers which are cubefree and not squarefree, i.e., numbers k such that {k, k+1, k+2} are in A067259.at n=25A071319
- Numbers n such that n and n+2 are of the form p^2*q where p and q are distinct primes.at n=21A074173
- Starting positions of strings of three 4's in the decimal expansion of Pi.at n=6A083615
- Shorthand of n-th smallest n-digit prime, see comments.at n=45A107108
- Numbers that are not the sum of two triangular numbers and a fourth power.at n=31A115160
- Expansion of (1+x)/(1-2x-x^2-x^3).at n=9A116413
- Numbers n such that n, n+1, n+2 and n+3 are products of exactly 3 primes.at n=16A124057
- Row sums of triangle A131819.at n=23A131820
- Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 9.at n=8A137070
- Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=4.at n=21A143447