2395
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2880
- Proper Divisor Sum (Aliquot Sum)
- 485
- 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
- 1912
- Möbius Function
- 1
- Radical
- 2395
- 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
- 32
- 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
- Numbers n such that n! has a square number of digits.at n=39A006488
- Coordination sequence T1 for Zeolite Code -CHI.at n=31A009846
- Super-3 Numbers (3n^3 contains substring '333' in its decimal expansion).at n=19A014569
- Numbers k such that the continued fraction for sqrt(k) has period 44.at n=17A020383
- a(n) = T(4n,n), where T is the array defined in A024996.at n=4A026075
- a(n) = (n+3)^2 - 6.at n=46A028878
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 20 ones.at n=36A031788
- Lucky numbers with size of gaps equal to 8 (lower terms).at n=24A031890
- Lucky numbers with size of gaps equal to 16 (upper terms).at n=6A031899
- a(n) = a(n-2) + 2*a(n-3) + a(n-4).at n=15A036605
- Numbers whose base-7 representation contains exactly three 6's.at n=19A043419
- Numbers k such that string 3,3 occurs in the base 8 representation of k but not of k-1.at n=37A044214
- Numbers k such that the string 5,1 occurs in the base 9 representation of k but not of k-1.at n=32A044297
- Numbers n such that string 9,5 occurs in the base 10 representation of n but not of n-1.at n=25A044427
- Numbers n such that string 3,3 occurs in the base 8 representation of n but not of n+1.at n=37A044595
- Numbers n such that string 5,1 occurs in the base 9 representation of n but not of n+1.at n=32A044678
- Numbers k such that string 9,5 occurs in the base 10 representation of k but not of k+1.at n=25A044808
- Numbers whose base-5 representation contains exactly two 0's and two 4's.at n=19A045212
- Self-convolution of 1 2 3 5 7 11 15 22 30 42 56 77 ... (A000041).at n=12A048574
- a(0)=4, a(1)=0, a(2)=0, a(3)=3; thereafter a(n) = a(n-3) + a(n-4).at n=39A050443