15769
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 16996
- Proper Divisor Sum (Aliquot Sum)
- 1227
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14544
- Möbius Function
- 1
- Radical
- 15769
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 84
- 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
- Strong pseudoprimes to base 47.at n=13A020273
- Numbers k such that (34*10^(k-1) - 43)/9 is a plateau prime.at n=12A082708
- Composite n such that both n and its reversal in base 10 are squarefree, none of the prime factors of n are palindromes and the prime factors of the reversal of n are the reversals of those of n.at n=5A083526
- Numbers k such that the k-th prime is in A057468.at n=21A102808
- Semiprimes in A003215.at n=29A113530
- Number of partitions of 3-smooth numbers into parts not greater than 3.at n=31A117220
- Largest number k such that k^2 divides A007781(6n+1).at n=35A127854
- Cuban composites: composite numbers equal to the difference of two consecutive cubes.at n=38A159961
- Number of 7-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=8A187381
- Number CG(n,3) of complete games with n players belonging to 3 types.at n=5A220887
- Numbers k such that (26*10^k - 167)/3 is prime.at n=17A294678
- Expansion of Product_{1 <= i <= j <= k} 1/(1 - x^(i*j*k)).at n=28A321360
- a(n) is the number of vertices formed by n-secting the angles of a nonagon (enneagon).at n=31A335782