7899
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 33
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10536
- Proper Divisor Sum (Aliquot Sum)
- 2637
- 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
- 5264
- Möbius Function
- 1
- Radical
- 7899
- 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
- 101
- 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
- Total number of parts in all partitions of n. Also, sum of largest parts of all partitions of n.at n=22A006128
- Number of ordered quadruples of integers from [ 2,n ] with no global factor.at n=19A015638
- 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 87.at n=30A031585
- Number of partitions of n into parts not of form 4k+2, 16k, 16k+3 or 16k-3.at n=54A036021
- Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,2,0,1.at n=4A037789
- Numbers n such that 235*2^n-1 is prime.at n=15A050869
- Nearest integer to Sum_{k=0..n} binomial(n,k)/2^(k*(k-1)/2).at n=48A079492
- a(n) = C(2n-1,n-1) mod n^3.at n=20A099907
- Abs(*+-) n Sequence.at n=41A119518
- Numbers n such that n^3 is zeroless pandigital.at n=34A124628
- Ulam's spiral (SSE spoke).at n=22A143839
- Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0100 pattern in any orientation.at n=10A146637
- Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111-0100 pattern in any orientation.at n=22A146639
- Numbers with rounded up arithmetic mean of digits = 9.at n=15A178369
- Floor(1/{(7+n^4)^(1/4)}), where {}=fractional part.at n=23A184631
- Generalized Markoff numbers: largest of 7-tuple of positive numbers a, b, c, d, e, f, g satisfying the Markoff(7) equation a^2+b^2+c^2+d^2+e^2+f^2+g^2 = 3abcdefg.at n=26A227211
- Odd numbers which are factored to the same set of primes in Z as to the irreducible polynomials in GF(2)[X]; odd terms of A235036.at n=19A235039
- a(n) = binomial(2*c-1, c-1) (mod c^3), where c is the n-th composite.at n=11A244214
- Semiprimes with strictly increasing product of digits.at n=45A246569
- Numbers k such that R_k + 40 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=10A256725