7426
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 11520
- Proper Divisor Sum (Aliquot Sum)
- 4094
- 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
- 3588
- Möbius Function
- -1
- Radical
- 7426
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 70
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- a(0) = 1, a(n) = 29*n^2 + 2 for n>0.at n=16A010019
- a(n) = least 2k such that p is the least prime in a Goldbach partition of 2k, where p = prime(n).at n=39A025017
- Numbers k such that least prime in the Goldbach partition of k increases.at n=11A025018
- Numbers having four 1's in base 9.at n=16A043460
- Smallest multiple of n with initial digits that of the reversal of n, deleting the leading zeros wherever required.at n=46A074156
- a(n) = 10*n^2 + 5*n + 1.at n=27A080860
- Integer part of Gauss's Arithmetic-Geometric Mean M(2,n^3).at n=37A127764
- a(n) = (7*n^2 + 15*n + 2) / 2.at n=45A131874
- 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, 0, 0), (0, -1, 1), (0, 1, 0), (1, 0, -1), (1, 1, 0)}.at n=7A150469
- a(n) is the least even number such that if p_i is the i-th prime then a(n)-p_i, i=1..n, are composite numbers.at n=33A152522
- a(n) is the least even number such that if p_i is the i-th prime then a(n)-p_i, i=1..n, are composite numbers.at n=34A152522
- a(n) is the least even number such that if p_i is the i-th prime then a(n)-p_i, i=1..n, are composite numbers.at n=35A152522
- a(n) is the least even number such that if p_i is the i-th prime then a(n)-p_i, i=1..n, are composite numbers.at n=36A152522
- a(n) is the least even number such that if p_i is the i-th prime then a(n)-p_i, i=1..n, are composite numbers.at n=37A152522
- a(n) is the least even number such that if p_i is the i-th prime then a(n)-p_i, i=1..n, are composite numbers.at n=38A152522
- a(n) = 225*n + 1.at n=32A158229
- Numbers n such that A234519(n) = n.at n=39A234524
- The 60-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=25A244802
- Least k such that k^(3^n)*(k^(3^n) - 1) + 1 is prime.at n=8A246120
- First occurrence of 2*n in A035096.at n=44A247234