2854
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4284
- Proper Divisor Sum (Aliquot Sum)
- 1430
- 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
- 1426
- Möbius Function
- 1
- Radical
- 2854
- 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
- 27
- 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
- yes
- Odd
- no
Appears in sequences
- Number of partitions of n into Fibonacci parts (with a single type of 1).at n=47A003107
- Coordination sequence T1 for Milarite.at n=33A008256
- Smallest positive number that can be written as sum of distinct Fibonacci numbers in n ways.at n=47A013583
- Apply partial sum operator 4 times to Stern's sequence.at n=9A014175
- Numbers k such that the continued fraction for sqrt(k) has period 86.at n=1A020425
- Positive integers which apparently never result in a palindrome under repeated applications of the function A056964(x) = x + (x with digits reversed).at n=34A023108
- Number of compositions into sums of cubes.at n=42A023358
- a(n) = 3*n^2 - 7*n + 6.at n=32A027599
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 52.at n=10A031550
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 32 ones.at n=10A031800
- Numbers k such that string 2,1 occurs in the base 9 representation of k but not of k-1.at n=39A044270
- Numbers n such that string 5,4 occurs in the base 10 representation of n but not of n-1.at n=31A044386
- Numbers n such that string 2,1 occurs in the base 9 representation of n but not of n+1.at n=39A044651
- Numbers n such that string 5,4 occurs in the base 10 representation of n but not of n+1.at n=31A044767
- Numbers whose base-5 representation contains exactly one 0 and three 4's.at n=28A045209
- Numbers whose base-5 representation contains exactly one 2 and three 4's.at n=33A045284
- Numbers k such that k^12 == 1 (mod 13^3).at n=15A056086
- Write the numbers from 1 to n^2 in a spiraling square; a(n) is the total of the sums of the two diagonals.at n=13A059924
- Composite and every divisor (except for 1) contains the digit 2.at n=32A062664
- Integers n > 196 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 196.at n=20A063049