6769
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7744
- Proper Divisor Sum (Aliquot Sum)
- 975
- 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
- 5796
- Möbius Function
- 1
- Radical
- 6769
- Omega Function (Ω)
- 2
- 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
- 44
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- no
- Odd
- yes
Appears in sequences
- Unsigned Stirling numbers of first kind s(n,4).at n=4A000454
- Stirling numbers of first kind s(n+4, n).at n=3A000915
- Hex (or centered hexagonal) numbers: 3*n*(n+1)+1 (crystal ball sequence for hexagonal lattice).at n=47A003215
- Triangle read by rows of Stirling numbers of first kind, s(n,k), n >= 1, 1 <= k <= n.at n=31A008275
- Triangle of Stirling numbers of first kind, s(n, n-k+1), n >= 1, 1 <= k <= n. Also triangle T(n,k) giving coefficients in expansion of n!*binomial(x,n)/x in powers of x.at n=32A008276
- Coordination sequence for FeS2-Pyrite, S position.at n=38A009956
- Numbers k such that Fib(k) == -13 (mod k).at n=26A023167
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 64 ones.at n=0A031832
- Composite numbers k such that digits in k and in juxtaposition of prime factors of k are the same (apart from multiplicity).at n=11A035141
- Positive numbers having the same set of digits in base 6 and base 9.at n=27A037436
- Positive numbers having the same set of digits in base 7 and base 9.at n=31A037439
- Numbers ending with '9' that are the difference of two positive cubes.at n=26A038864
- Sizes of successive balls in D_4 lattice.at n=26A046949
- Triangle of Stirling numbers of first kind, s(n,k), n >= 0, 0 <= k <= n.at n=40A048994
- Triangle of Stirling numbers of 1st kind, S(n, n-k), n >= 0, 0 <= k <= n.at n=40A054654
- Exponential reciprocal of A055924.at n=31A055925
- Composite and every divisor (except 1) contains the digit 7.at n=31A062676
- Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 3.at n=18A066273
- a(1) = 2; a(n) is smallest number > a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=46A074338
- Triangle read by rows: T(n,k) = |s(n,n+1-k)|, where s(n,k) are the signed Stirling numbers of the first kind A008276 (1 <= k <= n; in other words, the unsigned Stirling numbers of the first kind in reverse order).at n=32A094638