11922
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 23856
- Proper Divisor Sum (Aliquot Sum)
- 11934
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 3972
- Möbius Function
- -1
- Radical
- 11922
- Omega Function (Ω)
- 3
- 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
- 50
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Pisot sequence P(7,11), a(0)=7, a(1)=11, a(n+1) is the nearest integer to a(n)^2/a(n-1). Agrees with A021014 only for n <= 20.at n=17A021013
- a(n)=a(n-1)+a(n-2)-a(n-4)+a(n-5).at n=17A021014
- Numbers having four 2's in base 8.at n=29A043432
- Numbers which are the sum of their proper divisors containing the digit 9.at n=36A059468
- Numbers n with property that n^2 is a sum of some 70 successive primes.at n=16A166256
- Product plus sum of four consecutive nonnegative numbers.at n=9A166941
- Numbers k that divide the sum of digits of 21^k.at n=57A175589
- Numbers n such that 2^n'-1 is prime, where n' is the arithmetic derivative of n.at n=17A189992
- Smallest sets of 6 consecutive abundant numbers in arithmetic progression. The initial abundant number is listed.at n=23A228963
- Number of partitions of n such that at least half the parts are identical.at n=38A237269
- Number of integer partitions of n with no difference -2.at n=38A350842
- a(n) = number of near-Wieferich primes with |A| <= 10000 less than 10^n.at n=6A354678