16667
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 19056
- Proper Divisor Sum (Aliquot Sum)
- 2389
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14280
- Möbius Function
- 1
- Radical
- 16667
- 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
- 53
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers whose square has its digits in nondecreasing order.at n=42A028819
- Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion.at n=32A051003
- a(n) is the smallest m for which sqrt(sum of digits of m^2) = n.at n=8A061912
- a(n) = ceiling(10^(n-1)/n).at n=5A066559
- Smallest number whose square has sum of digits A056991(n).at n=28A067179
- Square roots of A068809.at n=21A068947
- Numbers m that divide the concatenation of m+1 and m+2.at n=15A069860
- Interprimes which are of the form s*prime, s=7.at n=17A075282
- Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=18A077292
- Centered hexamorphic numbers: the k-th centered hexagonal number, 3k(k-1)+1, ends in k.at n=19A094534
- a(n) = (5*10^n + 1)/3.at n=4A126109
- Beastly fax numbers: numbers containing the fax number of the Beast (667, one more than its regular number) in their decimal expansion.at n=26A138563
- Integers n such that digits in n and n^2 are in nondecreasing order.at n=33A234841
- a(n) is the smallest integer m such that sumdigits(m^2) = 4^n.at n=3A280798
- Numbers n with the property that n^2 contains a sequence of four or more consecutive 8's.at n=6A301938
- a(n) is the least k > 0 such that the sum of the decimal digits of k^2 is n, or 0 if no such k exists.at n=63A358702
- Number of successive occurrences of the same first digits in A366585.at n=45A366610
- Numbers k such that k*(k-1) is composed of exactly two different decimal digits.at n=29A380974
- Smallest k such that the sum of digits of k^2 in base 10 is divisible by n.at n=31A389004