12635
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 18288
- Proper Divisor Sum (Aliquot Sum)
- 5653
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8208
- Möbius Function
- 0
- Radical
- 665
- Omega Function (Ω)
- 4
- 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
- 63
- 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
- a(n) = (2*n - 3)n^2.at n=19A015238
- Composite numbers k with no prime factor among (2, 3) (cf. A038509) and such that phi(k) < 2*k/3.at n=37A069043
- Frobenius number of the numerical semigroup generated by 3 consecutive triangular numbers.at n=23A069755
- a(n) is the minimal area of a convex lattice polygon with 2n sides.at n=43A089187
- Fifth column of (1,5)-Pascal triangle A096940.at n=18A096942
- Numbers n such that P(11*n) is prime where P(n) is the partition number.at n=21A113499
- Numbers which are the sum of 3 cubes of distinct odd primes.at n=35A138853
- a(n) = 324n - 1.at n=38A158306
- G.f. is the polynomial (1-x^3) * (1-x^6) * (1-x^9) * (1-x^12) * (1-x^15) * (1-x^18) * (1-x^21) / (1-x)^7.at n=12A162595
- A156977/3.at n=8A164565
- Numbers k such that (10^(2k+1) - 6*10^k - 1)/3 is prime.at n=18A183174
- Numbers n such that n^6+6 and n^6-6 are prime.at n=1A239429
- Numbers k such that (2*10^k + 457)/9 is prime.at n=20A281276
- Deficient 2-hyperperfect numbers: numbers k such that 3*k/2 + 1/2 - sigma(k) is a proper divisor of k.at n=19A305617
- Numbers which are sum of three squares of positive numbers and also 5 times of the sum of their joint products.at n=2A347969
- a(n) = Sum_{d|n} d^(n + 1 - d - n/d).at n=11A359442
- Odd numbers k such that k divides A005940(k).at n=12A364545
- Numbers m such that the product m*(m+1) has a set of prime divisors, from greatest down to 2, that is missing exactly two prime divisors.at n=42A391970