13456
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 15
- Divisor Sum
- 27001
- Proper Divisor Sum (Aliquot Sum)
- 13545
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6496
- Möbius Function
- 0
- Radical
- 58
- Omega Function (Ω)
- 6
- 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
- yes
- 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
- 45
- 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
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- Number of positive integers <= 2^n of form x^2 + 3 y^2.at n=16A000205
- Number of points on surface of truncated tetrahedron: a(n) = 14*n^2 + 2 for n > 0, a(0)=1.at n=31A005905
- a(n) = (3n+2)^2.at n=39A016790
- a(n) = (4*n)^2.at n=29A016802
- a(n) = (5*n + 1)^2.at n=23A016862
- a(n) = (6*n + 2)^2.at n=19A016934
- a(n) = (7*n + 4)^2.at n=16A017030
- a(n) = (8*n + 4)^2.at n=14A017114
- a(n) = (9*n + 8)^2.at n=12A017258
- a(n) = (10*n + 6)^2.at n=11A017342
- a(n) = (11*n + 6)^2.at n=10A017462
- a(n) = (12*n + 8)^2.at n=9A017618
- [ (4th elementary symmetric function of P(n))/(2nd elementary symmetric function of P(n)) ], where P(n) = {1, p(1), p(2), ..., p(n-1)}, where p(0) = 1.at n=15A024535
- Squares with digits in nondecreasing order.at n=21A028820
- Squares k^2 in which the digits of k appear.at n=26A029773
- Squares such that digits of sqrt(n) appear in both n and n^(3/2).at n=20A029781
- Numbers with 15 divisors.at n=15A030633
- Numbers k such that 207*2^k + 1 is prime.at n=42A032480
- Composite numbers whose prime factors contain no digits other than 2 and 9.at n=36A036313
- Squares with initial digit '1'.at n=36A045784