7319
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
- 7896
- Proper Divisor Sum (Aliquot Sum)
- 577
- 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
- 6744
- Möbius Function
- 1
- Radical
- 7319
- 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
- 132
- 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
- Positive numbers having the same set of digits in base 4 and base 9.at n=38A037427
- Numbers n such that A003313(n) = A003313(2n).at n=24A086878
- Expansion of (1+4*x)/(1-x-3*x^2).at n=10A105963
- Numbers n such that pi(n^2)=pi((n-k)^2)+n, where k=A000193(n).at n=30A137271
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 1), (0, 0, -1), (1, 0, 0), (1, 0, 1)}.at n=7A150425
- Numerator of Bernoulli(n, -2/7).at n=4A158512
- Number of composite numbers between 2^n and 2^(n+1).at n=13A182095
- Odd nonprimes n such that n+d+1 is prime for all divisors d of n.at n=21A187554
- Number of (w,x,y) with all terms in {0,...,n} and w < range{w,x,y}.at n=25A212967
- Number of numbers which require n iterations of the unitary totient function (A047994) to reach 1.at n=16A225173
- Number of connected graphs on n vertices whose spectrum has n distinct eigenvalues.at n=7A242952
- Integers of the form 8k+7 that can be written as a sum of four distinct 'almost consecutive' squares.at n=40A243577
- Integers n of the form 8k+7 that are sum of distinct squares of the form m, m+1, m+2, m+4, where m == 1 (mod 4).at n=10A243578
- Number of length 3+1 0..n arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero.at n=29A250278
- Numbers missing from A001032 despite satisfying the necessary congruence conditions (see comments).at n=13A274469
- Numbers missing from A134419 despite satisfying the necessary congruence conditions (see comments).at n=15A274471
- G.f.: Product_{k>=1} (1 + x^k) / (1 - x^(k^2)).at n=32A280276
- Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 475", based on the 5-celled von Neumann neighborhood.at n=28A288500
- Numbers k such that k!6 - 36 is prime, where k!6 is the sextuple factorial number (A085158).at n=17A289700
- G.f.: Sum_{n>=0} x^n * Product_{k=0..n-1} (1 + (2*k+1)*x + x^2).at n=9A291848