9439
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 9440
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 9438
- Möbius Function
- -1
- Radical
- 9439
- 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
- 104
- 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
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1170
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Discriminants of quintic fields with 2 complex conjugates (negated).at n=9A023684
- Primes such that in p^2 the parity of digits alternates.at n=42A030145
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 97.at n=4A031595
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 58 ones.at n=12A031826
- Number of partitions in parts not of the form 13k, 13k+1 or 13k-1. Also number of partitions with no part of size 1 and differences between parts at distance 5 are greater than 1.at n=44A035949
- Primes p with property that p concatenated with its emirp p' (prime reversal) forms a palindromic prime of the form 'primemirp' (rightmost digit of p and leftmost digit of p' are blended together - p and p' palindromic allowed).at n=46A054217
- Numbers n such that 3*10^n - 1 is prime.at n=13A056703
- Primes with 22 as smallest positive primitive root.at n=2A061334
- Primes p such that q-p = 22, where q is the next prime after p.at n=14A061779
- Primes starting and ending with 9.at n=12A062335
- Numbers k such that 92^k - 91^k is prime.at n=2A062658
- Twin primes belonging to packs of four or more twin pairs.at n=5A068220
- Twin primes belonging to packs of three or more twin pairs.at n=42A069467
- Emirps which when concatenated with their reversals after a 0 make a palindromic prime of the form emirp0prime.at n=37A070954
- Numbers k that divide floor((3/2)^k) = A002379(k).at n=12A073633
- Group the composite numbers so that the sum of each group is a prime; sequence gives sum of terms in each group.at n=36A073686
- Primes for which the four closest primes are smaller.at n=18A075030
- Primes for which the five closest primes are smaller.at n=2A075037
- Primes whose 10's complement is a triangular number.at n=13A082992
- Last term of prime quadruples.at n=11A090258