1654
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2484
- Proper Divisor Sum (Aliquot Sum)
- 830
- 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
- 826
- Möbius Function
- 1
- Radical
- 1654
- 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
- 42
- 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
- yes
- Odd
- no
Appears in sequences
- Squares written in base 7.at n=25A002440
- Numbers that are the sum of 9 positive 6th powers.at n=22A003365
- Nonsquare values of m in the discriminant D = 4*m leading to a new maximum of the L-function of the Dirichlet series L(1) = Sum_{k>0} Kronecker(D,k)/k.at n=23A003421
- Coordination sequence T2 for Zeolite Code BOG.at n=29A008050
- Coordination sequence T2 for Zeolite Code NES.at n=26A008206
- Coordination sequence T5 for Zeolite Code -CLO.at n=36A009854
- Coordination sequence T4 for Zeolite Code DFO.at n=31A009878
- Coordination sequence T6 for Zeolite Code DFO.at n=31A009880
- Number of partitions of n into divisors of n.at n=41A018818
- a(n) = least m such that if r and s in {1/1, 1/3, 1/5,..., 1/(2n-1)} satisfy r < s, then r < k/m < s for some integer k.at n=33A024819
- a(n) = sum of the numbers between the two n's in A026366.at n=20A026369
- Coordination sequence T2 for Zeolite Code CGS.at n=30A027366
- Numbers k such that k^2+k+2 is a palindrome.at n=17A027712
- Numbers having period-2 7-digitized sequences.at n=30A031202
- 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 40.at n=5A031538
- Numbers whose base-5 expansions have 5 distinct digits.at n=38A031946
- Coordination sequence T3 for Zeolite Code SBS.at n=32A033610
- a(n+1) = a(n) + sum of squares of digits of a(n).at n=29A033936
- Number of partitions of n with equal number of parts congruent to each of 0, 1 and 2 (mod 5).at n=47A035572
- Number of partitions of n such that cn(0,5) = cn(1,5) = cn(2,5) <= cn(3,5) = cn(4,5).at n=59A036850