3929
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
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 3930
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 3928
- Möbius Function
- -1
- Radical
- 3929
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 100
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 545
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of numbers of complexity n, i.e., that can be built from n ones using + and *, and require at least that many ones.at n=28A005421
- Coordination sequence T1 for Zeolite Code RSN.at n=41A009885
- Numbers k such that the continued fraction for sqrt(k) has period 59.at n=3A020398
- Sequence satisfies T^2(a)=a, where T is defined below.at n=46A027594
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 26 ones.at n=33A031794
- Numbers k such that 23*2^k+1 is prime.at n=13A032361
- Primes of form x^2+65*y^2.at n=26A033241
- Primes of form x^2+83*y^2.at n=28A033253
- Position of first occurrence of n in continued fraction for Copeland-Erdős constant.at n=33A033309
- Number of proper factorizations of the numbers with a record number of proper factorizations.at n=49A033834
- Number of partitions satisfying (cn(0,5) <= cn(2,5) = cn(3,5) and cn(0,5) <= cn(1,5) and cn(0,5) <= cn(4,5)).at n=41A036807
- Coordination sequence T1 for Zeolite Code AWO.at n=43A038406
- Last member of a sexy prime quadruple: value of p+18 such that p, p+6, p+12 and p+18 are all prime.at n=15A046124
- Primes whose consecutive digits differ by 6 or 7.at n=14A048418
- Take the first n numbers written in base 3, concatenate them, then convert from base 3 to base 10.at n=4A048435
- Euclid-Mullin sequence (A000945) with initial value a(1)=257 instead of a(1)=2.at n=32A051333
- Positions in decimal expansion of Pi where next prime begins.at n=23A053013
- The first n digits of the juxtaposition of the base-3 numbers converted to decimal.at n=7A055144
- Primes p for which the period of reciprocal = (p-1)/8.at n=8A056213
- Numbers k such that 3^k - 2^k is prime.at n=16A057468