6937
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7936
- Proper Divisor Sum (Aliquot Sum)
- 999
- 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
- 5940
- Möbius Function
- 1
- Radical
- 6937
- 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
- 181
- 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 labeled n-node trees with unlabeled end-points.at n=7A001258
- Numbers k such that 9*2^k + 1 is prime.at n=33A002256
- Coordination sequence for sigma-CrFe, Position Xa.at n=21A009962
- Expansion of e.g.f.: sec(log(x+1)-tanh(x))=1+3/4!*x^4-40/5!*x^5+250/6!*x^6-1008/7!*x^7...at n=8A013292
- Numbers k such that the continued fraction for sqrt(k) has period 82.at n=12A020421
- Numbers k such that Fib(k) == 13 (mod k).at n=34A023178
- Lucky numbers with size of gaps equal to 14 (lower terms).at n=33A031896
- Partial sums of primes congruent to 1 mod 6.at n=36A038349
- Numerators of continued fraction convergents to sqrt(62).at n=6A041108
- Numbers m such that m divides Sum_{k = 1..m} A000005(k).at n=13A050226
- Numbers n such that n!! + 2^2 is prime.at n=16A076186
- Determinant of M(n), the n X n matrix defined by m(i,i) = 1, m(i,j) = i-j.at n=17A079034
- a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A001405(k) = C(k, floor(k/2)) equals n.at n=19A081394
- Least m such that the average number of divisors of all integers from 1 to m equals n, or 0 if no such number exists.at n=8A085567
- Semiprimes whose digit reversal is a nontrivial power.at n=22A108849
- Semiprimes (A001358) whose digit reversal is a powerful(1) number (A001694).at n=25A115688
- Semiprimes (A001358) whose digit reversal is a square.at n=19A115710
- Numbers k such that the digits of sigma(k) are a permutation of those of k, in base 10.at n=15A115920
- Number of 1's in all partitions of n with no even parts repeated.at n=28A117276
- Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the second column (n>=1, k>=0). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=30A121581