7943
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 8784
- Proper Divisor Sum (Aliquot Sum)
- 841
- 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
- 7176
- Möbius Function
- 0
- Radical
- 611
- 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
- 145
- 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 terms in 6th derivative of a function composed with itself n times.at n=11A022816
- Number of Dyck n-paths with ascents and descents of length equal to 1 (mod 4).at n=20A023427
- a(n) = position of 3*n^3 in A003072.at n=28A024970
- Near Cullen numbers: k such that (k+1)*2^k + 1 is prime.at n=21A029544
- Not necessarily symmetric n X 4 crossword puzzle grids.at n=3A034187
- Number of partitions satisfying cn(2,5) + cn(3,5) < cn(0,5) + cn(1,5) + cn(4,5).at n=33A039869
- Numbers whose base-5 representation contains exactly three 2's and three 3's.at n=1A045277
- 5-morphic but not bimorphic, automorphic nor trimorphic.at n=40A056036
- Numbers n such that n | 11^n + 10^n + 9^n + 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n.at n=19A057288
- Numbers n such that n and its reversal are both multiples of 13.at n=38A062903
- Non-palindromic number and its reversal are both multiples of 13.at n=24A062912
- Numbers k such that phi(k) divides sigma(k+1) + sigma(k).at n=45A067246
- Start with 1057 and repeatedly reverse the digits and add 2 to get the next term.at n=41A120215
- Odd interprimes divisible by 13.at n=34A124619
- a(n) = n^4 - 10n^3 + 35n^2 - 48n + 23.at n=11A137864
- Triangle [1,1,1,0,0,0,...] DELTA [1,0,0,0,...] with Deléham DELTA defined in A084938.at n=48A147703
- Triangle read by rows: T(n,k) = t(n,k) + t(n,n-k), where t(n,k) = 2*(n!/k!)*(2*(n + k) - 1).at n=21A154987
- Triangle read by rows: T(n,k) = t(n,k) + t(n,n-k), where t(n,k) = 2*(n!/k!)*(2*(n + k) - 1).at n=27A154987
- Numerator of Bernoulli(n, -2/3).at n=6A157811
- a(n) = 361*n + 1.at n=21A158310