9190
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 16560
- Proper Divisor Sum (Aliquot Sum)
- 7370
- 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
- 3672
- Möbius Function
- -1
- Radical
- 9190
- Omega Function (Ω)
- 3
- 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
- 60
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- yes
- Odd
- no
Appears in sequences
- Number of bipartite partitions.at n=15A002767
- n is equal to the number of 3s in all numbers <= n written in base 5.at n=16A014895
- Number of triples (i,j,k) with 1 <= i < j < k <= n and gcd(i,j,k) = 1.at n=40A015616
- a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A027170.at n=11A027179
- Numbers k such that 207*2^k + 1 is prime.at n=39A032480
- Denominators of continued fraction convergents to sqrt(847).at n=6A042635
- Numbers k such that reverse(k) is a prime factor of k.at n=47A072299
- Numbers n for which there are exactly six k such that n = k + (product of nonzero digits of k).at n=3A096927
- Structured pentagonal icositetrahedral numbers (vertex structure 10).at n=9A100168
- Slowest increasing sequence where the absolute difference between the last digit of a(n) and the first digit of a(n+1) equals 9.at n=31A101243
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.at n=7A150601
- a(n) = n*(2*n^2 + 5*n + 19)/2.at n=20A163675
- Numbers k such that |2^k - 57| is prime.at n=39A165778
- The number of labeled biconnected squaregraphs that contain n squares.at n=6A194089
- A generalized Engel expansion of 1/Pi.at n=5A232327
- a(n) = A255502(n)/2.at n=8A256030
- Coefficients of mock modular form H_1^(5) (divided by 2).at n=18A256054
- Numbers n such that the decimal equivalent of the binary reflected Gray code representation of n is a palindromic prime.at n=22A281382
- Number of odd parts in the partitions of n into 7 parts.at n=39A309622
- a(n) = 2*(a(n-1)+a(n-2)+a(n-3))-a(n-4) for n >= 4, with initial terms 0,0,1,0.at n=12A317976