1629
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2366
- Proper Divisor Sum (Aliquot Sum)
- 737
- 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
- 1080
- Möbius Function
- 0
- Radical
- 543
- 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
- 42
- 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
- G.f.: (1 + x^3 + x^4 + ... + x^12 + x^15)/Product_{i=1..10} (1 - x^i).at n=20A003403
- Cubes written backwards.at n=20A004165
- Icosahedral numbers: a(n) = n*(5*n^2 - 5*n + 2)/2.at n=8A006564
- Coordination sequence T1 for Zeolite Code JBW.at n=27A008121
- Coordination sequence T5 for Zeolite Code MTT.at n=25A008193
- Positive integers n such that 2^n (mod n) == 2^9 (mod n).at n=69A015931
- Coordination sequence T4 for Zeolite Code CGF.at n=28A019454
- Pseudoprimes to base 19.at n=16A020147
- Numbers k such that the continued fraction for sqrt(k) has period 38.at n=8A020377
- Fibonacci sequence beginning 1, 29.at n=10A022399
- (d(n)-r(n))/5, where d = A006527 and r is the periodic sequence with fundamental period (4,1,4,0,1).at n=27A026036
- Numbers whose set of base-6 digits is {1,3}.at n=35A032913
- Numbers in which all pairs of consecutive base-8 digits differ by 2.at n=45A033086
- Decimal part of a(n)^(1/2) starts with n so that a(n)<a(n+1).at n=36A034067
- Decimal part of a(n)^(1/6) starts with n so that a(n)<a(n+1).at n=43A034071
- Numbers k such that 0 and 1 occur juxtaposed in the base-9 representation of k but not of k-1.at n=35A043180
- Numbers k such that 1 and 2 occur juxtaposed in the base-9 representation of k but not of k-1.at n=38A043188
- Numbers k such that 2 and 9 occur juxtaposed in the base-10 representation of k but not of k-1.at n=32A043239
- Numbers k such that 0 and 1 occur juxtaposed in the base-9 representation of k but not of k+1.at n=35A043960
- Numbers k such that 2 and 6 occur juxtaposed in the base-10 representation of k but not of k+1.at n=32A044016