16279
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 16576
- Proper Divisor Sum (Aliquot Sum)
- 297
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 15984
- Möbius Function
- 1
- Radical
- 16279
- 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
- 115
- 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
- a(n) = 2^n - n*(n+1)/2.at n=14A014833
- Numbers whose base-5 representation has exactly 7 runs.at n=3A043607
- a(n) = (2*n-1)*(n^2 -n +6)/6.at n=36A049480
- Reverse of smallest prime factor of k = largest prime factor of k+1; a(1)=1.at n=17A071392
- Least x = a(n) such that sum of common prime divisors (without multiplicity) of sigma(x) and phi(x) equals n, or 0 if such number (apparently) does not exist.at n=38A082056
- Semiprimes n such that 3*n + 4 is a square.at n=24A112666
- Number of non-isomorphic maximal independent sets of the n-cycle graph having no symmetry axis.at n=50A127686
- Expansion of x(1-3x+5x^2-2x^3)/((1-x)^3*(1-2x)).at n=13A130104
- a(n) = Least integer k such that A249431(k) = n, and -1 if no such integer exists.at n=21A249430
- Semiprimes whose binary and ternary representations are prime when read in decimal.at n=21A279052
- Row 2 of A328464: a(n) = A276156(4n - 2) / 2.at n=29A328465
- Numbers N such that N + the sum of the cubes of its digits is again a third power.at n=18A362953