3749
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3936
- Proper Divisor Sum (Aliquot Sum)
- 187
- 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
- 3564
- Möbius Function
- 1
- Radical
- 3749
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 175
- 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+1) = a(n)-th composite number, with a(0) = 1.at n=26A006508
- Worst cases for Pierce expansions (numerators).at n=25A006537
- Coordination sequence T1 for Zeolite Code BIK.at n=37A008047
- Coordination sequence T1 for Zeolite Code MFS.at n=38A008173
- Numbers k such that the continued fraction for sqrt(k) has period 62.at n=6A020401
- Fibonacci sequence beginning 5, 13.at n=13A022138
- Number of 7's in all partitions of n.at n=33A024791
- Coordination sequence T3 for Zeolite Code MWW.at n=41A024988
- Coordination sequence T4 for Zeolite Code ITE.at n=42A027372
- Numbers whose base-3 representation Sum_{i=0..m} d(i)*3^i has d(m) < d(m-1) > d(m-2) < ...at n=38A032841
- Decimal part of a(n)^(1/7) starts with n so that a(n) < a(n+1).at n=24A034072
- Decimal part of n-th root of a(n) starts with digit 8.at n=12A034085
- Coordination sequence T3 for Zeolite Code AWO.at n=42A038405
- Numbers having four 4's in base 5.at n=20A043368
- Revert transform of 2*x*(1 - x - x^3 + x^4 - x^5)-x/(1+x).at n=7A049180
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 22.at n=20A051963
- 5-morphic but not bimorphic nor automorphic.at n=47A056033
- 5-morphic but not bimorphic, automorphic nor trimorphic.at n=28A056036
- Numbers k such that k^4 == 1 (mod 5^4).at n=23A056091
- Numbers k such that 2^k + 9 is prime.at n=34A057196