16120
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 32
- Divisor Sum
- 40320
- Proper Divisor Sum (Aliquot Sum)
- 24200
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5760
- Möbius Function
- 0
- Radical
- 4030
- Omega Function (Ω)
- 6
- Little Omega Function (ω)
- 4
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 97
- 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
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 13 ones.at n=29A031781
- Numbers that are divisible by 10 and are differences between two cubes in at least one way.at n=22A038854
- Numbers whose base-7 representation contains exactly four 6's.at n=10A043420
- Numbers k such that 3*5^k - 2 is prime.at n=25A057917
- Numbers which can be expressed as the product of a number and its reversal in at least two different ways.at n=11A066531
- Numbers n such that sigma(n)/phi(n) is prime.at n=29A067780
- Number of positions that are exactly n moves from the starting position in the Pyramorphix puzzle.at n=8A079764
- Polynexus numbers of order 9.at n=5A088891
- Numbers which are the sum of two positive cubes and divisible by 31.at n=28A102658
- Negative numbers written in a bits-of-Pi/primorial base system.at n=27A109839
- Cubeful numbers whose neighbors are also cubeful.at n=7A122692
- Numbers n such that sigma(n) = 7*phi(n).at n=8A136540
- Terms of A061039 that are multiple of 10, in the order in which they appear.at n=25A146762
- Numbers k such that (sum of base-2 digits of k) = (sum of base-10 digits of k) = 10.at n=30A152207
- a(n) = n^3 + (n+2)^3.at n=19A153976
- Number of ways to place 3 nonattacking zebras on a 3 X n board.at n=15A172221
- Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w^2>x^2+y^2.at n=20A211631
- Numbers that are both a sum and a difference of two positive cubes.at n=34A225908
- Numbers n such that sigma(n) - sigma(n-1) divides n.at n=12A227305
- Numbers k that divide sigma(k) - sigma(k-1).at n=16A227307