8379
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 27
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 14820
- Proper Divisor Sum (Aliquot Sum)
- 6441
- 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
- 4536
- Möbius Function
- 0
- Radical
- 399
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 158
- 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
- List of pairs of primes in reverse order, starting at 1.at n=11A007796
- Irregular triangle read by rows: Whitney numbers of the second kind a(n,k), n >= 1, k >= 0, for the star poset.at n=43A007799
- Numbers k that divide s(k), where s(1)=1, s(j)=9*s(j-1)+j.at n=35A014857
- Numbers k such that k divides 4^k - 1.at n=40A014945
- Define the sequence S(a_0,a_1) by a_{n+2} is the least integer such that a_{n+2}/a_{n+1}>a_{n+1}/a_n for n >= 0. This is S(3,6).at n=10A018909
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (1, p(1), p(2), ...), t = (composite numbers).at n=28A024480
- a(n) = 49*(n-1)*(n-2)/2.at n=17A027469
- a(n) = n + (n+1)^2 + (n+2)^3.at n=18A027620
- Numbers ending with '9' that are the difference of two positive cubes.at n=30A038864
- a(n) = (n+3)^3 - n^3.at n=28A038865
- Numbers n such that n | 12^n + 11^n + 10^n + 9^n.at n=47A057239
- McKay-Thompson series of class 20b for Monster.at n=20A058557
- Sum of divisors of twice square numbers.at n=43A065765
- Numbers from A066112 that are neither square nor twice a square, i.e., are not in A028982 but are in A028983.at n=30A066134
- Triangle read by rows, in which n-th row contains smallest set of n consecutive numbers with distinct prime signatures.at n=49A083788
- Least number beginning with prime(n) such that every concatenation is a prime.at n=22A090508
- Unsigned member r=-19 of the family of Chebyshev sequences S_r(n) defined in A092184.at n=4A099277
- a(n) = (7*n^3 + 6*n^2 + 5*n) / 6.at n=19A101165
- a(n) = (2*n-1)*(2*n+1)^2.at n=9A102094
- Number of noncrossing trees with n edges in which no border edges emanate from the root.at n=8A102594