516403 has 4 divisors (see below), whose sum is σ = 534240. Its totient is φ = 498568.

The previous prime is 516391. The next prime is 516407. The reversal of 516403 is 304615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304615 = 5 ⋅60923.

It is not a de Polignac number, because 516403 - 2⁵ = 516371 is a prime.

It is a Duffinian number.

516403 is a lucky number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (516407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8875 + ... + 8932.

It is an arithmetic number, because the mean of its divisors is an integer number (133560).

2⁵¹⁶⁴⁰³ is an apocalyptic number.

516403 is a deficient number, since it is larger than the sum of its proper divisors (17837).

516403 is a wasteful number, since it uses less digits than its factorization.

516403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17836.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 516403 is about 718.6118562896. The cubic root of 516403 is about 80.2286686769.

It can be divided in two parts, 516 and 403, that added together give a palindrome (919).

The spelling of 516403 in words is "five hundred sixteen thousand, four hundred three".