3147
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4200
- Proper Divisor Sum (Aliquot Sum)
- 1053
- 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
- 2096
- Möbius Function
- 1
- Radical
- 3147
- 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
- 123
- 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
- Coordination sequence T1 for Zeolite Code PAU.at n=41A008219
- Coordination sequence T2 for Zeolite Code RSN.at n=36A009886
- Coordination sequence T3 for Zeolite Code TER.at n=38A016435
- Fibonacci sequence beginning 3, 20.at n=12A022129
- Number of compositions of n into positive triangular numbers.at n=20A023361
- Product of n with 666 is palindromic.at n=17A030094
- 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 55.at n=10A031553
- "BGK" (reversible, element, unlabeled) transform of 1,1,1,1,...at n=24A032058
- Numbers whose set of base-6 digits is {2,3}.at n=35A032806
- Decimal part of a(n)^(1/7) starts with n so that a(n) < a(n+1).at n=16A034072
- Numerators of continued fraction convergents to sqrt(46).at n=8A041078
- Numerators of continued fraction convergents to sqrt(184).at n=8A041340
- Numerators of continued fraction convergents to sqrt(736).at n=6A042416
- Numbers k such that the string 7,6 occurs in the base 9 representation of k but not of k-1.at n=42A044320
- Numbers n such that string 4,7 occurs in the base 10 representation of n but not of n-1.at n=34A044379
- Numbers n such that string 4,7 occurs in the base 10 representation of n but not of n+1.at n=34A044760
- Numbers whose base-5 representation contains exactly three 0's and one 1.at n=31A045170
- Numbers whose base-5 representation contains exactly three 0's and one 2.at n=30A045185
- Numbers whose base-5 representation contains exactly three 0's and one 4.at n=29A045215
- Becomes prime or 4 after exactly 7 iterations of f(x) = sum of prime factors of x.at n=35A048129