1388
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2436
- Proper Divisor Sum (Aliquot Sum)
- 1048
- 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
- 692
- Möbius Function
- 0
- Radical
- 694
- 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
- 127
- 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
- Smallest number requiring n chisel strokes for its representation in Roman numerals.at n=22A002964
- Coordination sequence T4 for Zeolite Code LTN.at n=26A008143
- Coordination sequence T2 for Zeolite Code MEI.at n=27A008147
- Coordination sequence T1 for Zeolite Code MEP.at n=22A008157
- Coordination sequence T1 for Coesite.at n=20A008267
- "Pascal sweep" for k=7: draw a horizontal line through the 1 at C(k,0) in Pascal's triangle; rotate this line and record the sum of the numbers on it (excluding the initial 1).at n=47A009504
- Coordination sequence T3 for Zeolite Code -CLO.at n=33A009852
- Coordination sequence T1 for Zeolite Code VET.at n=23A009902
- Pisot sequence T(4,13), a(n) = floor(a(n-1)^2/a(n-2)).at n=5A010919
- Numbers k such that phi(k) + 10 | sigma(k + 10).at n=34A015789
- Numbers k such that the continued fraction for sqrt(k) has period 20.at n=29A020359
- a(n) = 3*a(n-1) + a(n-2) - a(n-3) - a(n-5).at n=5A022029
- Fibonacci sequence beginning 2, 24.at n=10A022374
- Numbers k such that Fibonacci(k) == -3 (mod k).at n=21A023164
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (1, p(1), p(2), ...).at n=35A024369
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (primes).at n=34A024377
- a(n) = position of n^3 + (n+1)^3 in A024670 (distinct sums of cubes of distinct positive integers).at n=44A024674
- Position of numbers of form 3*n^2 in A025060 (numbers of form j*k + k*i + i*j, where 1 <=i < j < k).at n=18A025064
- Duplicate of A024377.at n=34A025069
- Index of 4^n within the sequence of the numbers of the form 3^i*4^j.at n=46A025701