3926
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
- 8
- Divisor Sum
- 6384
- Proper Divisor Sum (Aliquot Sum)
- 2458
- 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
- 1800
- Möbius Function
- -1
- Radical
- 3926
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 82
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Number of partitions into non-integral powers.at n=28A000148
- Meandric numbers: number of ways a river can cross a road n times.at n=12A005316
- Number of meanders in which first bridge is 3.at n=11A006660
- Coordination sequence T3 for Zeolite Code MFS.at n=39A008175
- Numbers that are the sum of 3 positive cubes in more than one way.at n=28A008917
- Numbers that are the sum of 3 distinct positive cubes in 2 or more ways.at n=17A024974
- Numbers that are the sum of 3 positive cubes in exactly 2 ways.at n=28A025396
- Numbers that are the sum of 3 distinct positive cubes in exactly 2 ways.at n=17A025400
- Compose the natural numbers with themselves, A(x) = B(B(x)) where B(x) = x/(1-x)^2 is the generating function for natural numbers.at n=7A030267
- Numbers whose set of base-12 digits is {2,3}.at n=20A032812
- Composite numbers whose 3 prime factors are distinct in length.at n=37A046443
- 14-gonal (or tetradecagonal) numbers: a(n) = n*(6*n-5).at n=26A051866
- Positions in decimal expansion of Pi where next prime begins.at n=21A053013
- Smallest number that can be expressed as the sum of distinct Lucas numbers (A000204) in exactly n ways.at n=44A055635
- Numbers k such that 7^k == -1 (mod k-1).at n=12A055690
- Number of n-celled rotationally symmetric polyominoes without holes.at n=16A056883
- Even numbers k such that k/2 is nonprime and sigma(k+1) > sigma(k).at n=42A067827
- Smallest multiple of n-th prime which is == 1 mod (n+1)-st prime.at n=35A073603
- Total number of left truncatable primes (without zeros) in base n.at n=27A076623
- Meandric numbers for a river crossing two parallel roads at n points.at n=11A076876