4939
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5400
- Proper Divisor Sum (Aliquot Sum)
- 461
- 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
- 4480
- Möbius Function
- 1
- Radical
- 4939
- 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
- 134
- 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
- Greatest k such that binomial(k,n) has fewer than n distinct prime factors.at n=30A005735
- Coordination sequence T3 for Zeolite Code BRE.at n=46A008060
- Coordination sequence T6 for Zeolite Code VNI.at n=43A009912
- Number of distinct products ijk with 0 <= i < j < k <= n.at n=45A027429
- Poincaré (or Molien) series for ring of Siegel modular forms of genus 3 (associated with full modular group Gamma_3).at n=40A027634
- Numbers whose concatenation of prime factors (with multiplicity) is a square.at n=18A038693
- Numbers whose base-5 representation contains exactly three 2's and two 4's.at n=13A045291
- Number of positive integers <= 2^n of form 7 x^2 + 7 y^2.at n=17A054186
- Semiprimes p1*p2 such that p2 mod p1 = 9, with p2 > p1.at n=26A064907
- Numbers k such that prime(k+3)-(k+3)*tau(k+3) = prime(k-3)-(k-3)*tau(k-3) where tau(k) = A000005(k) is the number of divisors of k.at n=14A067355
- Indices of primes which remain prime if any one digit is deleted (leading zeros allowed).at n=38A084375
- Right-truncatable semiprimes.at n=44A085733
- Two-sided semiprimes: deleting any number of digits at left or at right, but not both, leaves a semiprime.at n=16A086698
- Numbers k such that sigma(phi(k)) - phi(sigma(k)) is nonzero and divisible by sigma(k), that is A065395(k)/A000203(k) is a nonzero integer.at n=14A092588
- a(n) = a(n-1) + 2*n^2 with a(1) = 1.at n=18A112524
- a(1) is the least k such that p(1) = (k*7)^2 + k*7 - 1 is prime, then a(n+1) is the least k such that (k*p(n))^2 + k*p(n) - 1 = p(n+1) is prime.at n=11A120394
- Numbers with composite sum of digits and prime sum of cubes of digits.at n=17A121642
- The Wiener index of a benzenoid consisting of a linear chain of n hexagons.at n=8A143938
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 0, 1), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.at n=6A151180
- Positions of powers of 2 in A084680.at n=47A173394