7326
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 17784
- Proper Divisor Sum (Aliquot Sum)
- 10458
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 2160
- Möbius Function
- 0
- Radical
- 2442
- Omega Function (Ω)
- 5
- Little Omega Function (ω)
- 4
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 70
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Let j = | i - i_written_backwards |, k = j + j_written_backwards; then k is in this sequence.at n=36A008920
- a(n) = (n^4 + n)/2 (Row sums of an n X n X n magic cube, when it exists).at n=11A027441
- a(n) = (3*n - 1)*(4*n - 1).at n=25A033578
- Number of nonnegative solutions of x1^2 + x2^2 + ... + x9^2 = n.at n=20A045851
- Numbers of the form k*(k^3 +- 1)/2.at n=21A057590
- The terms of A073211 (sums of two powers of 11) divided by 2.at n=11A073219
- Smallest multiple of n with initial digits that of the reversal of n, deleting the leading zeros wherever required.at n=36A074156
- a(n) is the least number with n palindromic divisors.at n=16A087997
- a(n) = n*(n^4 + 30*n^3 + 395*n^2 + 2910*n + 11064)/120.at n=9A090391
- Structured small rhombicubeoctahedral numbers.at n=10A100149
- Magic constant of smallest order-n perfect magic cube.at n=10A109130
- Eleventh column (m=10) of unsigned triangle A111595.at n=2A111784
- a(n) is the least number having exactly n representations as a product of two palindromes.at n=7A116993
- Least positive integer with even digit sum in bases 2..n.at n=21A135738
- Least positive integer with even digit sum in bases 2..n.at n=20A135738
- 11 times triangular numbers.at n=36A152740
- Indices of 4's in A090822.at n=32A157107
- Number of n X n arrays of squares of integers summing to 20.at n=1A159405
- Numbers k such that k^3 +-7 are primes.at n=25A176685
- Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of odd length (n>=0, k>=0).at n=53A202845