3938
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
- 8
- Divisor Sum
- 6480
- Proper Divisor Sum (Aliquot Sum)
- 2542
- 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
- 1780
- Möbius Function
- -1
- Radical
- 3938
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 25
- 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 paraffins.at n=25A005999
- Expansion of 1/((1-2x)(1-3x)(1-8x)(1-9x)).at n=3A025948
- Number of partitions of n that do not contain 9 as a part.at n=29A027343
- 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 62.at n=6A031560
- "BGK" (reversible, element, unlabeled) transform of 2,1,1,1,...at n=20A032062
- Numbers k such that 25*2^k+1 is prime.at n=23A032362
- Write 1,2,... in a clockwise spiral; sequence gives numbers on positive x axis.at n=31A033951
- Number of binary [ n,4 ] codes of dimension <= 4 without zero columns.at n=13A034338
- Triangle read by rows: T(n,k) = number of 2 X inf arrays [ n, n1, n2, ...; k, k1, k2,... ] with n>=n1>n2>...>=0, k>=k1>k2...>=0, n>k, n1>k1, ...; n >= 1, k >= 0. Note that once ni or ki = 0, the strict inequalities become equalities (constant 0 thereafter).at n=39A039597
- Numerators of continued fraction convergents to sqrt(495).at n=2A041944
- Numbers having three 5's in base 9.at n=8A043475
- Numbers whose base-5 representation contains exactly three 1's and two 2's.at n=22A045231
- Composite numbers whose 3 prime factors are distinct in length.at n=38A046443
- Starting from generation 6 add previous and next term yielding generation 7.at n=17A048453
- Number of pairs of sets of cardinality at least 3.at n=12A052516
- Numbers k such that 5*2^k + 3 is prime.at n=38A058586
- Values of k for which A065358(k) is 0.at n=44A064940
- Numbers n such that the area of the parallelogram formed by the vectors (n, prime(n)) and (n+1, prime(n+1)) is an integer square, i.e., Det[{{n, prime(n)},{n+1, prime(n+1)}}] is an integer square.at n=24A067805
- Numbers n such that phi(reverse(n)) = sigma(n).at n=6A070835
- Smallest of four consecutive integers divisible by four consecutive primes respectively.at n=22A072555