505206403 has 12 divisors (see below), whose sum is σ = 550756800. Its totient is φ = 463191456.

The previous prime is 505206397. The next prime is 505206461. The reversal of 505206403 is 304602505.

It is not a de Polignac number, because 505206403 - 2⁹ = 505205891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505206803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15150 + ... + 35212.

It is an arithmetic number, because the mean of its divisors is an integer number (45896400).

Almost surely, 2^505206403 is an apocalyptic number.

505206403 is a deficient number, since it is larger than the sum of its proper divisors (45550397).

505206403 is a wasteful number, since it uses less digits than its factorization.

505206403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20238 (or 20225 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 505206403 is about 22476.7969915644. The cubic root of 505206403 is about 796.4459020966.

Adding to 505206403 its reverse (304602505), we get a palindrome (809808908).

The spelling of 505206403 in words is "five hundred five million, two hundred six thousand, four hundred three".