5425
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
- 12
- Divisor Sum
- 7936
- Proper Divisor Sum (Aliquot Sum)
- 2511
- 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
- 3600
- Möbius Function
- 0
- Radical
- 1085
- Omega Function (Ω)
- 4
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 160
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Boustrophedon transform of odd numbers.at n=7A000754
- a(n) = (n-1)*n*(n+4)/6.at n=31A005581
- Number of permutations that are 2 "block reversals" away from 12...n.at n=11A007972
- Coordination sequence T2 for Zeolite Code MFI.at n=47A008165
- Pisot sequence E(8,10), a(n) = floor( a(n-1)^2/a(n-2) + 1/2 ).at n=26A010916
- First nontrivial or multidigital Armstrong number to base n.at n=23A016087
- Expansion of 1/((1-x)*(1-5*x)(1-6*x)).at n=4A016228
- Pseudoprimes to base 26.at n=35A020154
- Pseudoprimes to base 57.at n=36A020185
- Pseudoprimes to base 99.at n=44A020227
- Numbers k such that the continued fraction for sqrt(k) has period 50.at n=32A020389
- Low temperature series for spin-1/2 Ising partition function on 5D simple cubic lattice.at n=21A030047
- Values of Newton-Gregory forward interpolating polynomial (1/3)*(n-1)*(2*n+3)*(2*n-1).at n=16A030440
- Numbers k such that the sum of the squares of the divisors of k is divisible by k.at n=21A046762
- 20-gonal (or icosagonal) numbers: a(n) = n*(9*n-8).at n=25A051872
- Numbers n such that n | sigma_10(n).at n=38A055714
- Write 0,1,2,3,4,... in a triangular spiral; then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0,2,...at n=35A062708
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 71 ).at n=26A063344
- Composite numbers k with no prime factor among (2, 3) (cf. A038509) and such that phi(k) < 2*k/3.at n=19A069043
- Sum_{k=0..n^2} (k^2 - n^2)/n.at n=6A071902