1937
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2100
- Proper Divisor Sum (Aliquot Sum)
- 163
- 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
- 1776
- Möbius Function
- 1
- Radical
- 1937
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 50
- 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
- Number of integers <= 2^n of form 4 x^2 + 4 x y + 5 y^2.at n=14A000076
- a(n) = least m such that if a/b < c/d where a,b,c,d are integers in [0,n], then a/b < k/m < c/d for some integer k.at n=50A001000
- Length of one version of Kolakoski sequence {A000002(i)} at n-th growth stage.at n=19A001083
- a(n) = n^2 + 1.at n=44A002522
- A nonlinear recurrence.at n=31A003073
- Numbers which are the sum of 3 nonzero 4th powers.at n=46A003337
- Coordination sequence T1 for Zeolite Code -ROG.at n=33A009859
- Coordination sequence T2 for Zeolite Code CON.at n=31A009869
- Coordination sequence T7 for Zeolite Code CON.at n=31A009874
- Coordination sequence T1 for Zeolite Code RTE.at n=30A009890
- Coordination sequence T3 for Zeolite Code RTE.at n=30A009892
- Coordination sequence T1 for Zeolite Code RUT.at n=29A009897
- Nine iterations of Reverse and Add are needed to reach a palindrome.at n=6A015990
- Pseudoprimes to base 44.at n=22A020172
- Strong pseudoprimes to base 44.at n=6A020270
- a(n) = n*(23*n - 1)/2.at n=13A022280
- Number of terms in 5th derivative of a function composed with itself n times.at n=11A022815
- a(n) = least m such that if r and s in {1/4, 1/8, 1/12,..., 1/4n} satisfy r < s, then r < k/m < s for some integer k.at n=25A024825
- Least m such that if r and s in {Pi/2 - atn(h): h = 1,2,...,n} satisfy r < s, then r < k/m < s for some integer k.at n=49A024832
- Number of polyhexes of class PF2 (with two catafusenes annealated to pyrene).at n=4A026118