7418
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 11130
- Proper Divisor Sum (Aliquot Sum)
- 3712
- 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
- 3708
- Möbius Function
- 1
- Radical
- 7418
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 119
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 13.at n=38A020352
- Sum of first prime(n) primes.at n=16A022094
- Number of partitions of n into 8 unordered relatively prime parts.at n=38A023028
- n written in fractional base 10/7.at n=38A024662
- Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026714.at n=16A026724
- Cube of the lower triangular normalized 2nd kind Stirling matrix.at n=13A027496
- Second diagonal of A027496.at n=3A027502
- Molien series for group Gamma_{3,0}(2).at n=19A027632
- Expansion of 1/((1-4x)(1-6x)(1-7x)(1-11x)).at n=3A028133
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 7.at n=20A031420
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 13.at n=16A051978
- Let p(k) denote k-th prime; consider solutions (n,m) of the Diophantine system {p(p(n)+1)-p(p(n))=2, p(p(n))-6.p(p(m))=-1} (*); sequence gives values of m.at n=28A065511
- Numbers k such that k divides prime(k^2)+1.at n=18A067853
- Sum of n-th prime squared and n-th perfect square.at n=22A106587
- Sum of the first 2n+1 primes.at n=29A109723
- Numbers n such that p(6n) is prime, where p(n) is the number of partitions of n.at n=29A111036
- 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, 0), (-1, 1, 0), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.at n=8A149888
- Number of symmetry classes of 3 X 3 magilatin squares with positive values and magic sum n.at n=42A173730
- Number of symmetry classes of reduced 3 X 3 magilatin squares with largest entry n.at n=44A174019
- Semiprimes in A007504 (the sum of first n primes).at n=18A189072