16239
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 21656
- Proper Divisor Sum (Aliquot Sum)
- 5417
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10824
- Möbius Function
- 1
- Radical
- 16239
- 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
- 84
- 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
- Integers i > 1 for which there is no prime p such that i is a solution mod p of x^4 = 2.at n=28A065903
- Sum of primes between successive pairs of twin primes.at n=34A078731
- Number of base-3 circular n-digit numbers with adjacent digits differing by 1 or less.at n=11A124696
- Numbers of the form 110 + p^2. (where p is a prime).at n=30A138693
- Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-00010 pattern in any orientation.at n=12A147012
- a(n) = (9 + 14*n + 12*n^2 + 4*n^3)/3.at n=22A166911
- First number in the n-th row of A172002.at n=45A168388
- Number of independent vertex sets in the Moebius ladder graph with 2n nodes (n >= 0).at n=11A182143
- Number of length n words on {1,2,3} with no more than one consecutive 1 and no more than two consecutive 2's and no more than three consecutive 3's.at n=10A242452
- Numbers k such that A282442(k) = ceiling(k/2) + 1.at n=11A282427
- Number of multisets of nonempty words with a total of n letters over quaternary alphabet such that within each word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=8A292719
- Numbers k such that 465*2^k+1 is prime.at n=31A318193
- Length of the short leg of the unique primitive Pythagorean triple whose inradius is A002315(n) and such that its long leg and its hypotenuse are consecutive natural numbers.at n=5A377725