11979
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 27
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 19032
- Proper Divisor Sum (Aliquot Sum)
- 7053
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7260
- Möbius Function
- 0
- Radical
- 33
- Omega Function (Ω)
- 5
- 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
- 187
- 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
- yes
- Achilles Number
- yes
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers of the form 3^i*11^j.at n=23A003597
- Number of subgroups of index n in fundamental group of a certain fiber space.at n=5A027845
- a(n) = 11*n^2.at n=33A033584
- Numbers whose base-5 representation contains exactly two 0's and three 4's.at n=31A045213
- Odd numbers with exactly 5 palindromic prime factors (counted with multiplicity).at n=37A046375
- Numbers k such that k | 11^k + 10^k + 9^k + 8^k + 7^k + 6^k + 5^k + 4^k + 3^k + 2^k + 1^k.at n=33A057292
- Partial sums of A001158: Sum_{j=1..n} sigma_3(j).at n=13A064603
- Largest proper divisor of n^3.at n=31A071378
- a(1) = 1, a(n) = smallest (nontrivial) multiple of a(n-1) containing n digits, a(n) not equal to 10*a(n-1).at n=4A080445
- Numbers which are the sum of two positive cubes and divisible by 11.at n=21A101852
- Numbers of the form (9^i)*(11^j), with i, j >= 0.at n=13A108687
- Powerful(1) numbers (A001694) whose digit reversal is the product of 2 palindromes greater than 1.at n=43A115697
- Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k columns of odd length (0<=k<=n). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=55A121745
- Number of deco polyominoes of height n, consisting only of columns of even length. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=10A121746
- a(n) = denominator(3*(3+(-1)^n)/(n+1)^3).at n=32A129196
- a(n) = floor(n^3/3).at n=33A131476
- a(n) = ceiling(n^3/3).at n=33A131477
- a(n) = Product_{k=1..d(n)-1} gcd(b(k), b(k+1)), where b(k) is the k-th positive divisor of n and d(n) is the number of positive divisors of n.at n=65A136179
- Numbers of the form p^2 * q^3, where p,q are distinct primes.at n=26A143610
- a(n) = (2*n^3 + 5*n^2 + 11*n)/2.at n=21A162263