2190
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 5328
- Proper Divisor Sum (Aliquot Sum)
- 3138
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 576
- Möbius Function
- 1
- Radical
- 2190
- 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
- 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
- 76
- 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 primes < prime(n)^2.at n=33A000879
- Numbers that are the sum of 6 positive 6th powers.at n=18A003362
- Numbers that are the sum of 4 positive 7th powers.at n=5A003371
- Numbers that are the sum of at most 4 positive 7th powers.at n=18A004866
- Numbers that are the sum of at most 5 positive 7th powers.at n=24A004867
- Numbers that are the sum of at most 6 positive 7th powers.at n=31A004868
- Numbers that are the sum of at most 7 positive 7th powers.at n=39A004869
- Numbers that are the sum of at most 8 positive 7th powers.at n=48A004870
- a(n) = ceiling(n*phi^11), where phi is the golden ratio, A001622.at n=11A004966
- a(n) = 1 + n/2 + 9*n^2/2.at n=22A006137
- Coordination sequence T2 for Zeolite Code APD.at n=31A008035
- Coordination sequence T2 for Zeolite Code EAB and OFF.at n=34A008083
- Coordination sequence T4 for Zeolite Code MTT.at n=29A008192
- Theta series of A_5 lattice.at n=16A008445
- Theta series of direct sum of 5 copies of hexagonal lattice.at n=3A008656
- a(n) = b(n) - c(n) where b(n) is the n-th Lucas number greater than 3 and c(n) is the n-th number not in sequence b( ).at n=13A014252
- Expansion of 1/((1-5*x)(1-6*x)(1-7*x)).at n=3A019757
- Pisot sequence T(7,10), a(n) = floor(a(n-1)^2/a(n-2)).at n=27A020752
- a(n) = n*(11*n - 1)/2.at n=20A022268
- Place where n-th 1 occurs in A023119.at n=40A022781