4252
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 7448
- Proper Divisor Sum (Aliquot Sum)
- 3196
- 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
- 2124
- Möbius Function
- 0
- Radical
- 2126
- Omega Function (Ω)
- 3
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 77
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence T4 for Zeolite Code DDR.at n=41A008074
- Coordination sequence T1 for Zeolite Code CON.at n=46A009868
- Coordination sequence T2 for Zeolite Code RSN.at n=43A009886
- Coordination sequence T2 for Zeolite Code RUT.at n=43A009898
- Numbers k such that the continued fraction for sqrt(k) has period 52.at n=20A020391
- 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 32.at n=38A031530
- Numbers with exactly five distinct base-8 digits.at n=0A031985
- Decimal part of cube root of a(n) starts with 2: first term of runs.at n=15A034128
- Number of rooted identity trees with n nodes and 3 leaves.at n=18A055328
- Partition the concatenation 1234567...of natural numbers into successive strings which are multiples of 4, all different and > 4. (0 never taken as the most significant digit.)at n=7A077297
- Index of the first occurrence of prime(n) in A060324.at n=25A078454
- Numbers k such that 2^(k+1) - 1 is prime.at n=18A090748
- Exponents m such that 1-A065395(2^m) is a power of 2, where A065395(n) = sigma(phi(n)) - phi(sigma(n)).at n=23A092591
- An "L" digit is a digit "looking to the Left" (1,2,3,7,9); an "R" digit is a digit "looking to the Right" (4,5,6); an "U" digit is a digit "looking at Us" (0,8). This is the slowest increasing sequence showing the infinite pattern [LR] (when read digit-by-digit).at n=41A093102
- a(n) = smallest number greater than a(n-1) having a largest proper divisor that is greater than and coprime to a(n-1); a(1) = 1.at n=29A098144
- Number of distinct values of i*j + j*k + k*i with 1 <= i<= j < k <= n.at n=45A102534
- Location of the restriction sites for the enzyme BseMII in PhiX174 DNA.at n=8A108776
- a(n) = Fibonacci(n-1) + prime(n).at n=19A113753
- n + sigma(n) + phi(n) is a cube.at n=6A116008
- Integers 1 through n written in primorial base, summed as if decimal.at n=22A122613