1859
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2196
- Proper Divisor Sum (Aliquot Sum)
- 337
- 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
- 1560
- Möbius Function
- 0
- Radical
- 143
- Omega Function (Ω)
- 3
- 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
- 130
- 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
- Sum of adjacent Catalan numbers.at n=7A005807
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=41A006285
- Coordination sequence T2 for Zeolite Code MTW.at n=28A008197
- Coordination sequence for Ni2In, Position Ni1 and In.at n=13A009941
- a(n) = (2*n - 15)*n^2.at n=13A015247
- Numbers k such that the continued fraction for sqrt(k) has period 20.at n=45A020359
- In base 11, a(n) = sum of digits of Lucas(a(n)).at n=24A025491
- a(n) = n + (n+1)^2 + (n+2)^3.at n=10A027620
- Number of binary sequences of length n with an even number of ones, at least two of the ones being contiguous.at n=11A027711
- Triangle T(n,m) = Sum_{k=0..m} Catalan(n-k)*Catalan(k).at n=37A028364
- Triangle read by rows: T(n,m) = Sum Catalan(n-k)*Catalan(k), k=0..m.at n=47A028376
- Concatenate rows of triangle in A028364 (removing duplicates).at n=30A028378
- Numbers whose base-5 representation has 3 fewer 0's than 4's.at n=31A031476
- Numbers k such that 65*2^k+1 is prime.at n=24A032382
- Products p^3 or p^2*q, where {p,q} are consecutive primes.at n=14A033477
- a(n) = 11*n^2.at n=13A033584
- Numbers that can be expressed as the product of three 2-digit numbers.at n=29A033830
- Divisors = 3 (mod 4) of Descartes's 198585576189.at n=29A033871
- Number of partitions of n into parts not of the form 23k, 23k+2 or 23k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 10 are greater than 1.at n=29A035990
- Composite numbers whose prime factors contain no digits other than 1 and 3.at n=43A036303