11907
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 20748
- Proper Divisor Sum (Aliquot Sum)
- 8841
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6804
- Möbius Function
- 0
- Radical
- 21
- Omega Function (Ω)
- 7
- 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
- 50
- 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
- yes
- Achilles Number
- yes
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers of the form 3^i*7^j with i, j >= 0.at n=27A003594
- Numbers k such that k divides 4^k - 1.at n=44A014945
- a(n) = (2*n - 15)*n^2.at n=21A015247
- Odd numbers k that divide phi(k)*sigma(k).at n=16A015706
- Numbers k such that k | 5^k + 1.at n=40A015951
- Numbers whose prime factors are 3 and 7.at n=14A033850
- Number of partitions satisfying cn(0,5) <= cn(1,5) + cn(2,5) and cn(0,5) <= cn(4,5) + cn(2,5) and cn(0,5) <= cn(1,5) + cn(3,5) and cn(0,5) <= cn(4,5) + cn(3,5).at n=35A039843
- Numbers k that divide 5^k + 4^k.at n=31A045590
- Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=8A046320
- Numbers k that divide sigma(k) * phi(k) and are not divisible by 6.at n=42A047630
- Composites c whose decimal expansion ends with its largest prime factor.at n=30A050693
- Numbers k such that k | 6^k + 5^k + 4^k + 3^k + 2^k + 1^k.at n=43A056745
- Numbers n such that n | 8^n + 7^n + 6^n.at n=35A057233
- Numbers n such that n | 12^n + 11^n + 10^n + 9^n + 8^n + 7^n + 6^n.at n=42A057263
- Numbers n such that n | 12^n + 11^n + 10^n + 9^n + 8^n + 7^n + 6^n + 5^n + 4^n.at n=36A057285
- Numbers k such that k | 11^k + 10^k + 9^k + 8^k + 7^k + 6^k + 5^k + 4^k + 3^k.at n=34A057286
- Numbers n such that n | 10^n + 9^n + 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n.at n=34A057287
- Numbers whose product of exponents is equal to the sum of prime factors.at n=19A071175
- L-th order palindromes with L > 2.at n=1A089381
- Denominators of terms in series expansion of (sin(tan(x)) - tan(sin(x))) / (arcsin(arctan(x)) - arctan(arcsin(x))).at n=3A096730