7325
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 9114
- Proper Divisor Sum (Aliquot Sum)
- 1789
- 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
- 5840
- Möbius Function
- 0
- Radical
- 1465
- Omega Function (Ω)
- 3
- 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
- 70
- 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 paraffins C_n H_{2n-1} X_3 with n carbon atoms.at n=10A000641
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AEL = AlPO4-11 [Al20P20O80] starting with a T2 atom.at n=5A018946
- Alternately append n-th prime to beginning or end of previous term.at n=3A053065
- Number of ways to partition 2*n into distinct positive integers not greater than n.at n=29A079122
- Numbers k such that k and k^2 use only the digits 2, 3, 5, 6 and 7.at n=17A137080
- Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.at n=9A143879
- Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.at n=9A143884
- Numbers n such that prime[(n + 1)^2] - prime[n^2] is a perfect square.at n=15A145290
- Numbers k such that continued fraction of (1 + sqrt(k))/2 has period 5.at n=42A146330
- Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 3^(n-1)*binomial(n-2, k -1) otherwise.at n=31A146987
- Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 3^(n-1)*binomial(n-2, k -1) otherwise.at n=32A146987
- Nonprimes with all digits distinct, all digits prime, and a nonprime number of digits.at n=13A165245
- Composite numbers of form 8n+5 with all prime factors of form 8m+5.at n=30A175486
- Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=15A192951
- Triangle of coefficients of polynomials v(n,x) jointly generated with A210743; see the Formula section.at n=41A210744
- 18k^2-12k-7 interleaved with 18k^2+6k+5 for k>=0.at n=41A216853
- Total number of ON cells at stage 2n of two-dimensional 5-neighbor outer totalistic cellular automaton defined by "Rule 457".at n=48A246327
- Triangle read by rows: coefficients in Bell's formula for number of ways of making change with a certain set of coins.at n=19A262551
- a(n) = n*(25*n - 39)/2.at n=25A263231
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 758", based on the 5-celled von Neumann neighborhood.at n=6A273489