5921
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6144
- Proper Divisor Sum (Aliquot Sum)
- 223
- 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
- 5700
- Möbius Function
- 1
- Radical
- 5921
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 186
- 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
- Coordination sequence T2 for Zeolite Code MTN.at n=46A008187
- a(n) = (n+1)*(n^2 +8*n +6)/6. Number of n-dimensional partitions of 4. Number of terms in 4th derivative of a function composed with itself n times.at n=30A008778
- Pseudoprimes to base 39.at n=17A020167
- Strong pseudoprimes to base 39.at n=7A020265
- Numbers k such that the continued fraction for sqrt(k) has period 50.at n=40A020389
- In base 11, a(n) = sum of digits of Lucas(a(n)).at n=45A025491
- Numbers having period-1 7-digitized sequences.at n=37A031201
- a(n) = n + Sum_{k=0..n} k!.at n=7A036781
- Birthday set of order 9: i.e., numbers congruent to +- 1 modulo 2, 3, 4, 5, 6, 7, 8 and 9.at n=37A057541
- Composite numbers with all divisors congruent to 1 mod 10.at n=42A068872
- a(n)=A074639(A074647(n)).at n=28A074648
- Main diagonal of table A083047.at n=11A083048
- a(n) = (n^3 + 24*n^2 + 65*n + 36)/6.at n=26A087863
- Numbers which are the sum of three positive cubes and divisible by 31.at n=30A104054
- Numbers m such that (15m-4, 15m-2, 15m+2, 15m+4) is a prime quadruple.at n=34A112540
- Row sums of number triangle A114278.at n=12A114279
- Numbers k such that k and 8*k, taken together, are zeroless pandigital.at n=13A115932
- Numbers n such that sigma(n) - phi(n) is a repdigit greater than 2.at n=31A116020
- Pascal-(1,9,1) array.at n=32A143685
- Pascal-(1,9,1) array.at n=31A143685