2926
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 5760
- Proper Divisor Sum (Aliquot Sum)
- 2834
- 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
- 1080
- Möbius Function
- 1
- Radical
- 2926
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- yes
- 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
- 141
- 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
- Binomial coefficient C(7n,n-9).at n=2A004377
- Second pentagonal numbers: a(n) = n*(3*n + 1)/2.at n=44A005449
- 4-dimensional analog of centered polygonal numbers.at n=12A006325
- Coordination sequence T5 for Zeolite Code GOO.at n=37A008115
- Coordination sequence T4 for Zeolite Code RSN.at n=35A009888
- Expansion of Product_{k>=1} (1 - x^k)^22.at n=4A010828
- Second hexagonal numbers: a(n) = n*(2*n + 1).at n=38A014105
- Even triangular numbers.at n=38A014494
- Numbers k such that k | 10^k + 10.at n=16A015902
- Numbers k such that k | 13^k + 13.at n=8A015905
- Binomial coefficients C(n,75).at n=2A017739
- Binomial coefficients C(77, n).at n=2A017793
- Smallest triangular number that begins with n.at n=28A018855
- Pseudoprimes to base 9.at n=30A020138
- Pseudoprimes to base 23.at n=30A020151
- Pseudoprimes to base 25.at n=34A020153
- Pseudoprimes to base 93.at n=27A020221
- Number of positive integers that are not the sum of distinct n-th-order polygonal numbers.at n=27A025524
- Number of partitions of n that do not contain 7 as a part.at n=28A027341
- a(n) = (prime(n)-3)*(prime(n)-5)/8.at n=35A030007