13489
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 16128
- Proper Divisor Sum (Aliquot Sum)
- 2639
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11040
- Möbius Function
- -1
- Radical
- 13489
- 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
- 76
- 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
- Triangle read by rows: cube of the lower triangular mean matrix.at n=15A027447
- Numerator of Sum_{k=1..n} H(k)/k, where H(k) is k-th harmonic number.at n=5A027459
- Numbers that are the product of 3 prime factors whose concatenation is a palindrome.at n=28A046452
- Smallest number m with nonzero digits such that A046810(m)=n.at n=29A046813
- a(n) is the least integer that has exactly n anagrams that are primes.at n=29A046890
- Numbers n such that A048767(n+1)=A048767(n).at n=19A048769
- Number of squares on infinite half chessboard at <=n knight moves from a fixed point on the diagonal.at n=44A098499
- Square array T(n,k) read by antidiagonals: numerators of Stirling numbers of first kind with negative argument S1(-n,k), n,k>=0.at n=38A103879
- Triangle of numerators of the cube of a certain lower triangular matrix.at n=15A119935
- Number of integers in the smallest interval containing both minimal and maximal possible apex values of an addition triangle whose base is a permutation of n+1 consecutive integers.at n=11A206604
- Number of 3 X n 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=40A224039
- Square array read by ascending antidiagonals where T(n,k) is the mean number of maxima in a set of n random k-dimensional real vectors (numerators).at n=30A257894
- One of the two successive approximations up to 5^n for the 5-adic integer sqrt(-4). These are the 4 mod 5 numbers (except for n=0).at n=6A269590
- One of the two successive approximations up to 5^n for the 5-adic integer sqrt(-4). These are the 4 mod 5 numbers (except for n=0).at n=7A269590
- Alternating sum of centered heptagonal pyramidal numbers.at n=28A270694
- Expansion of -(10*x^2 - 6*x + 1)*sqrt(1 - 4*x)/(3*x - 1)^2.at n=10A320825
- First column of A027447.at n=5A329108
- Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 7 (mod m), where U(m)=A004187(m) and V(m)=A056854(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=7 and b=1, respectively.at n=37A337781
- Dimension of the space of Siegel cusp forms of genus 3 and weight 2n.at n=48A352095
- a(n) is the least positive integer that has exactly n anagrams that are semiprimes, or -1 if there is no such integer.at n=41A362499