1329
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1776
- Proper Divisor Sum (Aliquot Sum)
- 447
- 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
- 884
- Möbius Function
- 1
- Radical
- 1329
- Omega Function (Ω)
- 2
- 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
- 52
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- 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) = n*(11*n^2 - 5)/6.at n=9A004467
- Coordination sequence T3 for Zeolite Code AFS and BPH.at n=28A008025
- Coordination sequence T5 for Zeolite Code BOG.at n=26A008053
- Coordination sequence T2 for Zeolite Code DAC.at n=23A008068
- Coordination sequence T6 for Zeolite Code DDR.at n=23A008076
- Expansion of e.g.f.: log(1 + tanh(x))*exp(x).at n=10A009390
- Expansion of e.g.f.: log(1 + tanh(x))*exp(x).at n=9A009390
- a(n) = floor( n*(n-1)*(n-2)/27 ).at n=34A011909
- Composite numbers that are equal to the sum of the first k composites for some k.at n=33A013921
- a(n) = n^2 + 3*n - 1.at n=35A014209
- Numbers k such that the continued fraction for sqrt(k) has period 36.at n=7A020375
- n-th composite is sum of first k composites for some k.at n=36A020642
- a(n) = a(n-1) + a(n-2) + 1, with a(0) = 1 and a(1) = 7.at n=12A022321
- Place where n-th 1 occurs in A023119.at n=31A022781
- Numbers k such that Fibonacci(k) == -2 (mod k).at n=22A023163
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = (primes).at n=13A024603
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = (primes).at n=12A025117
- Numbers that are the sum of 3 nonzero squares in exactly 10 ways.at n=24A025330
- Numbers that are the sum of 3 nonzero squares in 10 or more ways.at n=43A025338
- Numbers that are the sum of 3 distinct nonzero squares in exactly 8 ways.at n=35A025346