7859
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 29
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8160
- Proper Divisor Sum (Aliquot Sum)
- 301
- 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
- 7560
- Möbius Function
- 1
- Radical
- 7859
- 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
- yes
- 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
- Number of partitions of n with equal number of parts congruent to each of 0 and 2 (mod 4).at n=42A035541
- Sum of n-th row of triangle of primes: 2; 2 3 2; 2 3 5 3 2; 2 3 5 7 5 3 2; ...; where n-th row contains 2n+1 terms.at n=44A061802
- Expansion of (5 - 9*x + 6*x^2)/(1-x)^4.at n=28A080957
- Semiprimes that are the sum of two positive cubes. Common terms of A003325 and A046315.at n=32A085366
- a(n) = (1/24)*(n+1)*(3*n^3+59*n^2+358*n+648).at n=12A090949
- Lesser of twin simili-primes of order 2.at n=29A126699
- Number of binary strings of length n with equal numbers of 0001 and 0010 substrings.at n=14A164155
- A185128(n) is the a(n)-th triangular number.at n=42A185223
- Number of ordered septuples of distinct pairwise coprime positive integers with largest element n.at n=18A186978
- Number of 6-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=19A186982
- Least number having exactly two odd prime factors that differ by 2*n^2.at n=10A190052
- Triangle of coefficients of polynomials u(n,x) jointly generated with A210748; see the Formula section.at n=47A210747
- Numbers which are the sum of two positive cubes and divisible by 29.at n=4A224483
- Happycab numbers: the smallest happy number that is the sum of two cubes of happy numbers in n different ways.at n=0A268583
- Euler elliptic Carmichael numbers for the elliptic curve y^2 = x^3 + 80.at n=7A290338
- Elliptic Carmichael numbers for the elliptic curve y^2 = x^3 + 80.at n=12A317174
- Odd composite integers such that A005668(m)^2 == 1 (mod m).at n=45A338080
- Numbers that are the sum of an even cube s and an odd cube t such that 0 < s < t.at n=39A339998
- a(n) = Sum_{i=1..n+1} prime(i)*Sum_{j=0..i-1} binomial(n,j).at n=7A343414
- Discriminants of imaginary quadratic fields with class number 34 (negated).at n=30A351672