1075
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 1364
- Proper Divisor Sum (Aliquot Sum)
- 289
- 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
- 840
- Möbius Function
- 0
- Radical
- 215
- 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
- 23
- 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
- a(n) = least value of m for which Liouville's function A002819(m) = -n.at n=29A002053
- a(n) = ceiling(n*phi^7), where phi is the golden ratio, A001622.at n=37A004962
- Positions of remoteness 5 in Beans-Don't-Talk.at n=32A005697
- From a partition of the integers.at n=23A006628
- Coordination sequence T3 for Zeolite Code AFS and BPH.at n=25A008025
- Multiples of 25.at n=43A008607
- Coordination sequence T4 for Zeolite Code VET.at n=20A009905
- Pseudoprimes to base 49.at n=31A020177
- Numbers k such that the continued fraction for sqrt(k) has period 26.at n=17A020365
- a(n) = a(n-1) + a(n-2) + 1 for n>1, a(0)=0, a(1)=3.at n=13A022308
- Index of 3^n within sequence of numbers of form 2^i*3^j (A003586).at n=36A022330
- Fibonacci sequence beginning 1, 31.at n=9A022401
- Numbers with exactly 5 1's in ternary expansion.at n=35A023696
- Position of n^3 + 9 in A024975.at n=20A024979
- Numbers k such that (#1's in s(1),...,s(k)) = -1 + (#1's in r(1),...,r(k)), where s = A025142 and r = A025143.at n=29A025145
- Number of partitions of n into distinct parts >= 3.at n=50A025148
- Index of 5^n within the sequence of the numbers of the form 5^i*9^j.at n=53A025710
- Index of 7^n within the sequence of the numbers of the form 2^i*7^j.at n=27A025720
- Number of distinct products ijk with 1 <= i,j,k <= n.at n=22A027425
- Sequence satisfies T^2(a)=a, where T is defined below.at n=38A027587