3646
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5472
- Proper Divisor Sum (Aliquot Sum)
- 1826
- 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
- 1822
- Möbius Function
- 1
- Radical
- 3646
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 162
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers that are the sum of 6 positive 6th powers.at n=25A003362
- Coordination sequence T5 for Zeolite Code BOG.at n=43A008053
- Coordination sequence T5 for Zeolite Code RSN.at n=40A009889
- Coordination sequence T4 for Zeolite Code VNI.at n=37A009910
- Numbers k such that the continued fraction for sqrt(k) has period 100.at n=1A020439
- Number of partitions of n that do not contain 5 as a part.at n=30A027339
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 60.at n=4A031558
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 44 ones.at n=3A031812
- Numbers whose set of base-15 digits is {1,3}.at n=16A032922
- Coordination sequence T2 for Zeolite Code CFI.at n=40A033600
- Number of partitions of n with equal nonzero number of parts congruent to each of 1 and 3 (mod 5).at n=41A035567
- Molien series for 3-D group R2+R3.at n=31A037242
- Can express a(n) with the digits of a(n)^2 in order, only adding plus signs.at n=36A038206
- a(n)=(s(n)+4)/9, where s(n)=n-th base 9 palindrome that starts with 5.at n=20A043076
- Numbers n such that prime(n) - sigma(n) - phi(n) = prime(n+1) - sigma(n+1) - phi(n+1), where sigma(n) = sum of divisors of n.at n=34A048783
- a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i), array T as in A048149.at n=23A049714
- Numbers k such that k^8 == 1 (mod 9^3).at n=10A056084
- Coordination sequence T6 for Zeolite Code MTF.at n=36A057309
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 55 ).at n=34A063328
- Let S = 123456789101112131415..., the concatenation of the natural numbers; partition this string into distinct squarefree numbers. To avoid leading zeros, no number may end at the digit that comes before a 0 in S.at n=43A085943