7579
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
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 9072
- Proper Divisor Sum (Aliquot Sum)
- 1493
- 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
- 6240
- Möbius Function
- -1
- Radical
- 7579
- 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
- 132
- 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
- no
- Odd
- yes
Appears in sequences
- Dedekind numbers: number of monotone Boolean functions or antichains of subsets of an n-set containing at least one nonempty set.at n=5A007153
- Numbers n such that phi(n + 1) | sigma(n) for n congruent to 1 (mod 3).at n=24A015817
- Sums of six consecutive squares: a(n) = n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 + (n+5)^2.at n=33A027865
- Odd elements in 4-Pascal triangle A028275 (by row) that are not 1.at n=41A028278
- Odd elements in 4-Pascal triangle A028275 (by row) that are not 1.at n=44A028278
- Distinct elements in 4-Pascal triangle A028275 (by row).at n=52A028280
- Distinct odd elements in 4-Pascal triangle A028275 (by row).at n=24A028281
- Elements to right of central elements in 4-Pascal triangle A028275.at n=57A028284
- Elements to right of central elements in 4-Pascal triangle A028275 that are not 1.at n=43A028285
- Odd elements (greater than 1) to right of central elements in 4-Pascal triangle A028275.at n=19A028287
- Shortest edge c of (measured by the longest edge) primitive Euler bricks (a, b, c, sqrt(a^2 + b^2), sqrt(b^2 + c^2), sqrt(a^2 + c^2) are integers).at n=25A031175
- Sort then Add, a(1)=19.at n=12A033900
- a(n) = least odd number which can be represented in the form p + 2*k^2, k>0, in n different ways.at n=38A060004
- a(n) = n^3 - n^2 - n - 1.at n=20A083074
- Numbers k such that numerator of Sum_{i=1..k} 1/(prime(i)-1) is prime.at n=55A092063
- Triangle of numerators of coefficients of Faulhaber polynomials in Knuth's version.at n=59A093556
- Matrix cube-root of triangle A107717.at n=15A107719
- Column 0 of triangle A107719.at n=5A107720
- Number of partitions of n containing a clique of size 3.at n=34A183560
- Unhappy numbers which enter the cycle (4, 16, 37, 58, 89, 145, 42, 20) at 20.at n=36A193572