1955
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2592
- Proper Divisor Sum (Aliquot Sum)
- 637
- 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
- 1408
- Möbius Function
- -1
- Radical
- 1955
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 99
- 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
- no
- Odd
- yes
Appears in sequences
- 7th-order maximal independent sets in cycle graph.at n=50A007389
- Coordination sequence T8 for Zeolite Code MFI.at n=28A008171
- Coordination sequence T3 for Zeolite Code ZON.at n=31A009921
- Orders of cyclotomic polynomials containing a coefficient the absolute value of which is >= 3.at n=19A013591
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly three 1's.at n=27A013650
- Sum of remainders of n mod prime(k), for k = 1,2,3,...,n.at n=50A024925
- a(n) = A000522(n) - 2.at n=5A026243
- Denominators of continued fraction convergents to sqrt(534).at n=6A042021
- Numbers n such that string 4,3 occurs in the base 8 representation of n but not of n-1.at n=34A044222
- Numbers n such that string 1,2 occurs in the base 9 representation of n but not of n-1.at n=27A044262
- Numbers n such that string 5,5 occurs in the base 10 representation of n but not of n-1.at n=19A044387
- Numbers n such that string 4,3 occurs in the base 8 representation of n but not of n+1.at n=34A044603
- Numbers k such that string 1,2 occurs in the base 9 representation of k but not of k+1.at n=27A044643
- Numbers n such that string 5,5 occurs in the base 10 representation of n but not of n+1.at n=19A044768
- Numbers whose base-5 representation contains exactly two 0's and two 3's.at n=28A045197
- Convolution of A000108 (Catalan numbers) with A020920.at n=3A045492
- Triangle related to A001700 and A000302 (powers of 4).at n=32A046658
- Number of factorizations with one level of parentheses indexed by prime signatures. A050336(A025487).at n=38A050337
- Number of partitions of n with parts (with repetitions) forming a division lattice (i.e., closed under GCD and LCM).at n=42A051839
- Squarefree terms of A050530 with 3 prime divisors.at n=27A053339