16400
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 30
- Divisor Sum
- 40362
- Proper Divisor Sum (Aliquot Sum)
- 23962
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6400
- Möbius Function
- 0
- Radical
- 410
- Omega Function (Ω)
- 7
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 40
- 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
- yes
- Odd
- no
Appears in sequences
- Number of paraffins.at n=39A005997
- a(n) = n*(n^2 + 1)/2.at n=32A006003
- 9-gonal (or enneagonal) pyramidal numbers: a(n) = n*(n+1)*(7*n-4)/6.at n=24A007584
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 16.at n=15A031694
- Sums of 2 distinct powers of 4.at n=23A038470
- Sums of 4 distinct powers of 5.at n=24A038476
- Concatenations of two squares in two ways.at n=8A038670
- Number of chiral n-ominoes in n-1 space.at n=18A045649
- a(n) = 1 + 2^(n-1) + n for n > 0, a(0) = 2.at n=15A052968
- a(n) = Sum_{k=1..n, gcd(n,k) = 1} k^3.at n=19A053819
- Numbers k such that phi(k) and cototient(k) are squares but k is not in A054755.at n=12A054756
- Sums of two powers of 4.at n=30A055236
- Smallest term of A056757 (numbers for which the cube of the number of divisors exceeds the number) between 2^(n-1) and 2^n.at n=14A056766
- Numbers k such that 3*2^k + 5 is prime.at n=52A057913
- Numbers which can be written as b^2*c^2*(b^2+c^2).at n=23A063663
- Numbers n such that phi(n) is a proper substring of n.at n=7A066663
- Numbers n such that the digits of n end in phi(n).at n=8A067206
- a(n) = (8^n + 2^n)/2.at n=5A081342
- From P-positions in a certain game.at n=14A081691
- a(n) = 10*a(n-2) - 16*a(n-4) for n > 3, a(0) = 1, a(1) = 5, a(2) = 14, a(3) = 34.at n=9A083332