10403
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10608
- Proper Divisor Sum (Aliquot Sum)
- 205
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10200
- Möbius Function
- 1
- Radical
- 10403
- 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
- 148
- 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
- a(n) = (4*n+1)*(4*n+3).at n=25A001539
- Products of 2 successive primes.at n=25A006094
- Numbers that can be expressed as the product of two 3-digit numbers in at least one way.at n=7A033829
- Smallest number with two distinct prime factors both of length n.at n=2A037049
- Numbers that are the product of a pair of twin primes.at n=8A037074
- Numerators of continued fraction convergents to sqrt(559).at n=7A042070
- Numbers k such that k + the reversal of k is a square.at n=34A061230
- Nonprimes m such that phi(m)*sigma(m) is divisible by m+1.at n=38A065148
- Smallest solution m to (n+1)*phi(m) = n*sigma(m), or -1 if no solution exists.at n=24A065824
- a(n) = A065824(A047845(n+1)).at n=10A065884
- Product of twin primes of form (4*k+1,4*k+3), k>0.at n=4A071697
- Numbers k such that A072010(k) = k.at n=40A072011
- A Fibonacci-like model in which each pair of rabbits dies after the birth of their 4th litter: a(n) = a(n-2) + a(n-3) + a(n-4) + a(n-5).at n=23A072465
- Multiplicative closure of twin prime pair products (A037074).at n=17A074480
- Numbers k such that the difference between the largest and the smallest prime divisor of k equals the number of prime divisors of k (counted with multiplicity).at n=47A086770
- Numbers n such that n+1 and phi(n)+1 are both perfect squares.at n=17A089952
- Numbers k such that k+1 and sigma(k)+1 are both perfect squares.at n=12A089954
- Column 5 of triangle A091602.at n=40A091608
- Numbers k such that k, k+2, k+4, k+6, k+8 are semiprimes.at n=34A092127
- Chebyshev U(n,x) polynomial evaluated at x=51.at n=2A097725