12503403 has 20 divisors (see below), whose sum is σ = 20377368. Its totient is φ = 7577280.

The previous prime is 12503371. The next prime is 12503417. The reversal of 12503403 is 30430521.

It is not a de Polignac number, because 12503403 - 2⁵ = 12503371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12503423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6126 + ... + 7907.

Almost surely, 2^12503403 is an apocalyptic number.

12503403 is a deficient number, since it is larger than the sum of its proper divisors (7873965).

12503403 is a wasteful number, since it uses less digits than its factorization.

12503403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14056 (or 14047 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 12503403 is about 3536.0151300581. The cubic root of 12503403 is about 232.1005002055.

Adding to 12503403 its reverse (30430521), we get a palindrome (42933924).

The spelling of 12503403 in words is "twelve million, five hundred three thousand, four hundred three".