3899
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 29
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4464
- Proper Divisor Sum (Aliquot Sum)
- 565
- 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
- 3336
- Möbius Function
- 1
- Radical
- 3899
- 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
- 144
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) is the number of unlabeled modular lattices on n nodes.at n=14A006981
- Coordination sequence T2 for Zeolite Code CON.at n=44A009869
- Composite numbers whose prime factors contain no digits other than 5 and 7.at n=16A036320
- Numbers n such that string 9,9 occurs in the base 10 representation of n but not of n-1.at n=38A044431
- Numbers k such that string 8,9 occurs in the base 10 representation of k but not of k+1.at n=38A044802
- Numbers n such that string 9,9 occurs in the base 10 representation of n but not of n+1.at n=38A044812
- Numbers whose base-4 representation contains exactly one 0 and four 3's.at n=33A045070
- Numbers whose base-5 representation contains exactly three 1's and two 4's.at n=19A045261
- Squarefree nonprimes with property that the concatenation of the prime factors is a palindrome.at n=36A046448
- Semiprimes whose prime factors, when concatenated, yield a palindrome.at n=33A046451
- Discriminants of imaginary quadratic fields with class number 24 (negated).at n=38A048925
- a(n)=[A*a(n-1)+B*a(n-2)+C]/p^r, where p^r is the highest power of p dividing [A*a(n-1)+B*a(n-2)+C], A=1.0001, B=1.0001, C=1.5, p=2.at n=36A053522
- Number of connectable 3 X n binary matrices.at n=5A054420
- Numbers k such that prime(k+3)-(k+3)*tau(k+3) = prime(k)-k*tau(k) where tau(k) = A000005(k) is the number of divisors of k.at n=28A067356
- Smallest composite number with digit sum n.at n=28A067524
- a(n) is the smallest composite number with the sum of digits = the n-th prime number.at n=9A073868
- a(n) = smallest multiple of 7 with a digit sum = n.at n=27A077493
- a(0) = 2, a(n) is the smallest squarefree number > a(n-1) such that the sum a(n) + a(i) for all i = 1 to (n-1) is squarefree. Or, sum of any two terms is a squarefree number.at n=42A085902
- a(n) = 6*n*(n-1) - 1.at n=26A103115
- Sum of the right diagonal in ordered 3 X 3 prime squares.at n=23A105091