16447
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16448
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16446
- Möbius Function
- -1
- Radical
- 16447
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 190
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1906
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- [ Sum{(sqrt(j+1)-sqrt(i+1))^3} ], 1 <= i < j <= n.at n=45A025223
- Numbers whose base-4 representation contains exactly four 0's and three 3's.at n=15A045084
- Primes at which the difference pattern X42Y (X and Y >= 6) occurs in A001223.at n=31A052164
- Positions of the elements of the quasicyclic group Z+(2a+1)/(2^b) [a > 0 and a < 2^(b-1), b > 0] at the ]0,1[ side of the Stern-Brocot Tree (A007305/A007306).at n=34A065674
- Numbers n such that sum of cubes of even digits of n equals sum of cubes of odd digits of n.at n=6A076165
- Primes p such that sum of cubes of even digits of p equals sum of cubes of odd digits of p.at n=0A076166
- Prime numbers which when written in base 7 have a composite digit-sum.at n=32A096790
- Prime centuries with exactly one prime year in each decade.at n=1A103608
- Primes from merging of 5 successive digits in decimal expansion of cos(1).at n=20A104961
- Prime Friedman numbers.at n=12A112419
- Sequence of numerators of the continued fraction derived from the sequence of the number of distinct factors of a number (A001221, also called omega(n)).at n=17A112595
- Numbers k such that k*sigma(k)*sigma(sigma(k)) is a triangular number.at n=3A116005
- Number of permutations in S_n avoiding {bar 1}432{bar 5} (i.e., every occurrence of 432 is contained in an occurrence of a 14325).at n=9A137556
- 10^n-th squarefree number > 1.at n=4A140809
- Primes congruent to 44 mod 47.at n=34A142395
- Primes congruent to 17 mod 53.at n=38A142547
- Primes congruent to 45 mod 59.at n=33A142772
- Primes congruent to 38 mod 61.at n=33A142836
- Primes congruent to 32 mod 67.at n=31A154621
- Indices of records in A157190: prime(a(n)) can be written in more ways as pq-p-q (p,q, prime) than any smaller prime.at n=9A157191