12947
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 14364
- Proper Divisor Sum (Aliquot Sum)
- 1417
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11660
- Möbius Function
- 0
- Radical
- 1177
- 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
- 125
- 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
- Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026670.at n=19A026680
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 13 ones.at n=21A031781
- a(1) = 190, a(n) = prime(a(n-1)) - 5a(n-1).at n=7A179518
- Number of third differences of arrays of length n+3 of numbers in 0..5.at n=2A228257
- T(n,k)=Number of third differences of arrays of length n+3 of numbers in 0..k.at n=23A228260
- Number of third differences of arrays of length 6 of numbers in 0..n.at n=4A228262
- Product between n-th prime and next perfect square.at n=27A229497
- S_9 sequence in partition of integers > 1 described in A240521.at n=33A240536
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 137", based on the 5-celled von Neumann neighborhood.at n=28A270276
- a(n) = T(n, 4) with T(n, k) = Sum_{d|k} phi(d)*binomial(n - 1 + k/d, k/d).at n=22A327032
- Nonsquarefree numbers k such that A003415(k) divides A276086(k), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=25A371085
- a(n) is the number of multisets of n positive decimal digits where the sum of the digits equals the product of the prime digits.at n=38A384505