1269
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 1920
- Proper Divisor Sum (Aliquot Sum)
- 651
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 828
- Möbius Function
- 0
- Radical
- 141
- Omega Function (Ω)
- 4
- 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
- 39
- 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
- no
- Odd
- yes
Appears in sequences
- Number of integer points in a certain quadrilateral scaled by a factor of n.at n=53A002789
- Numbers that are the sum of 4 positive 5th powers.at n=19A003349
- Numbers that are the sum of at most 4 positive 5th powers.at n=47A004844
- a(n) = ceiling(n*phi^8), where phi is the golden ratio, A001622.at n=27A004963
- Record values in A005210.at n=38A005211
- Smallest number that requires n iterations of the bi-unitary totient function (A116550) to reach 1.at n=28A005424
- Some permutation of digits is a cube.at n=49A007939
- Noncubes such that some permutation of digits is a cube.at n=39A007940
- Coordination sequence T1 for Zeolite Code EUO.at n=22A008095
- Coordination sequence for Paracelsian.at n=24A008260
- Odd numbers k such that d(k) does not divide phi(k).at n=33A015734
- Numbers k such that phi(k + 13) | sigma(k).at n=40A015833
- Expansion of 1/(1-x^8-x^9-x^10-x^11-x^12-x^13-x^14-x^15-x^16-x^17-x^18).at n=48A017876
- Nearest integer to Gamma(n + 1/6)/Gamma(1/6).at n=8A020036
- a(n) = floor( Gamma(n + 1/6)/Gamma(1/6) ).at n=8A020081
- Number of partitions of n into 9 unordered relatively prime parts.at n=25A023029
- Convolution of A023532 and A001950.at n=34A023603
- Convolution of A000201 and A014306.at n=42A023666
- a(n) = floor(C(2n,n)/2^n).at n=13A024502
- Numbers that are the sum of 3 nonzero squares in exactly 8 ways.at n=44A025328