9425
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 13020
- Proper Divisor Sum (Aliquot Sum)
- 3595
- 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
- 6720
- Möbius Function
- 0
- Radical
- 1885
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 153
- 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
- no
- Odd
- yes
Appears in sequences
- Number of trees by stability index.at n=18A003427
- Pseudoprimes to base 57.at n=45A020185
- Fibonacci sequence beginning 0, 25.at n=14A022359
- Numbers that are the sum of 2 nonzero squares in exactly 6 ways.at n=1A025289
- Numbers that are the sum of 2 nonzero squares in 5 or more ways.at n=3A025296
- Numbers that are the sum of 2 nonzero squares in 6 or more ways.at n=1A025297
- Numbers that are the sum of 2 distinct nonzero squares in exactly 6 ways.at n=1A025307
- Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways.at n=2A025315
- Numbers that are the sum of 2 distinct nonzero squares in 6 or more ways.at n=1A025316
- Number of prime powers (p^2, p^3, ...) <= 2^n.at n=32A036386
- a(n) in base 12 is a repdigit.at n=38A048336
- a(n) = n*(2*n+5)*(n-1)/6.at n=30A051925
- a(1) = 1; a(n+1) = sum of terms in continued fraction for sum{k=1 to n}[a(n+1-k)/a(k)].at n=13A057873
- a(n) = 2*n^4 + 2*n^3 + 3*n^2 + 2*n + 1.at n=8A058920
- Centered 19-gonal numbers.at n=31A069132
- Numbers n such that sopf(sigma(n)) = sigma(sopf(n)), where sopf(x) = sum of the distinct prime factors of x.at n=23A076532
- Numbers n such that ((n-1)^2+1)/2 and n^2+1 and ((n+1)^2+1)/2 are prime if n is even or (n-1)^2+1 and (n^2+1)/2 and (n+1)^2+1 are prime if n is odd.at n=42A082612
- Numbers k such that (17*10^(k-1) - 71)/9 is a plateau prime.at n=7A082702
- a(n) = 10*n^2 - 6*n + 1.at n=30A087348
- Numbers m that are the hypotenuse of exactly 22 distinct integer-sided right triangles, i.e., m^2 can be written as a sum of two squares in 22 ways.at n=1A097103