5825
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 7254
- Proper Divisor Sum (Aliquot Sum)
- 1429
- 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
- 4640
- Möbius Function
- 0
- Radical
- 1165
- Omega Function (Ω)
- 3
- 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
- 49
- 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
- If a, b in sequence, so is ab+7.at n=41A009312
- Numbers k such that the continued fraction for sqrt(k) has period 27.at n=23A020366
- Fibonacci sequence beginning 0, 25.at n=13A022359
- Numbers that are the sum of 3 distinct positive cubes in 2 or more ways.at n=36A024974
- 4th elementary symmetric function of C(n,0), C(n,1), ..., C(n,n).at n=2A025133
- (n-1)st elementary symmetric function of binomial(n,0), binomial(n,1), ..., binomial(n,n).at n=4A025135
- Numbers that are the sum of 3 distinct positive cubes in exactly 2 ways.at n=35A025400
- Number of partitions of n with equal nonzero number of parts congruent to each of 0, 1 and 3 (mod 5).at n=55A035583
- a(n) = T(4,n), array T given by A048471.at n=6A036545
- Number of n-node rooted identity trees of height 5.at n=14A038089
- Number of nonnegative integer 2 X 2 matrices with no zero rows or columns and with sum of elements equal to n, up to row and column permutation.at n=48A054974
- Numbers k that, when expressed in base 4 and then interpreted in base 9, give a multiple of k.at n=17A062925
- a(n+1) = a(n)+greatest prime divisor of a(n-1).at n=39A078695
- a(1)=2; for n>1, a(n)=2*a(n-1)-1 if that number is composite, a(n)=a(n-1)+1 otherwise.at n=19A081869
- a(n) = n*(n^2+3*n-1)/3.at n=25A084990
- Unicode codes for the lunation runes, used in certain medieval Scandinavian perpetual calendar staves as golden numbers 1-19.at n=8A098476
- Main diagonal of A101866.at n=39A101867
- Numbers for which the sum of the digits is the square root of the product of their digits.at n=14A117720
- Start with 1 and repeatedly reverse the digits and add 62 to get the next term.at n=17A118157
- Numbers n such that first occurrence of the 10 digits of the i-th root of n contain all the digits from 0 to 9.at n=32A119521