4215
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 6768
- Proper Divisor Sum (Aliquot Sum)
- 2553
- 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
- 2240
- Möbius Function
- -1
- Radical
- 4215
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 157
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Number of bipartite partitions of n white objects and 4 black ones.at n=12A000465
- Genus of modular group Gamma(n) = genus of modular curve Chi(n).at n=47A001767
- a(n) = round(n*phi^14), where phi is the golden ratio, A001622.at n=5A004949
- a(n) = ceiling(n*phi^14), where phi is the golden ratio, A001622.at n=5A004969
- Centered dodecahedral numbers.at n=7A005904
- Coordination sequence T4 for Zeolite Code RTH.at n=45A009896
- a(n) is the sum over all floor(k^3/n), k=0 to n inclusive.at n=24A014818
- Coordination sequence T1 for Zeolite Code CGF.at n=45A019451
- Pseudoprimes to base 59.at n=23A020187
- Pseudoprimes to base 79.at n=24A020207
- Every suffix prime and no 0 digits in base 6 (written in base 6).at n=36A024781
- Sums of five consecutive squares: a(n) = n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2.at n=27A027578
- 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 11.at n=39A031509
- Numerators of continued fraction convergents to sqrt(487).at n=4A041928
- Numbers having, in base 16, (sum of even run lengths)=(sum of odd run lengths).at n=21A044887
- Numbers whose base-5 representation contains exactly two 1's and three 3's.at n=20A045243
- Coordination sequence T5 for Zeolite Code ISV.at n=45A047962
- Number of compositions of n into nonprime numbers.at n=22A052284
- Positive integer values of k such that 10*k^2 - 9 is a square.at n=7A052454
- Reversion of y - y^2 - y^3 - y^4 - y^5.at n=8A063024