12904
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 24210
- Proper Divisor Sum (Aliquot Sum)
- 11306
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6448
- Möbius Function
- 0
- Radical
- 3226
- Omega Function (Ω)
- 4
- 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
- 24
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 90.at n=27A020429
- Centered 23-gonal numbers.at n=33A069174
- Rounded total surface area of a regular dodecahedron with edge length n.at n=25A071397
- Triangle, read by rows, where row n equals the inverse binomial transform of column n in the rectangular table A124460.at n=40A124469
- Triangle read by rows given by [1,1,1,1,1,1,1,1,1,1,...] DELTA [1,1,0,0,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938.at n=41A167685
- Number of strings of numbers x(i=1..n) in 0..n with sum i^2*x(i)^3 equal to n^5.at n=8A184310
- For positive n with prime decomposition n = Product_{j=1..m} (p_j^k_j) define A_n = Sum_{j=1..m} (p_j*k_j) and B_n = Sum_{j=1..m} (p_j^k_j). This sequence gives those n for which A_n and B_n are both prime and B_n = A_n + 2 (i.e., form a twin prime pair).at n=29A185718
- Number of unimodal functions [1..n]->[0..2].at n=22A223718
- Number of ways to choose an integer partition of each factor in a factorization of n.at n=33A318948
- Number of ways to write n as an orderless product of orderless sums.at n=33A318949
- Indices of primes followed by a gap (distance to next larger prime) of 44.at n=8A320720
- Discriminants of imaginary quadratic fields with class number 38 (negated).at n=37A351676
- Number of skew shapes in a 3 X n rectangle with no empty rows or columns.at n=17A362153