12400503 has 8 divisors (see below), whose sum is σ = 16588416. Its totient is φ = 8239800.

The previous prime is 12400489. The next prime is 12400511. The reversal of 12400503 is 30500421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12400503 - 2⁸ = 12400247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5713 + ... + 7578.

It is an arithmetic number, because the mean of its divisors is an integer number (2073552).

Almost surely, 2^12400503 is an apocalyptic number.

12400503 is a deficient number, since it is larger than the sum of its proper divisors (4187913).

12400503 is a wasteful number, since it uses less digits than its factorization.

12400503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13605.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 12400503 is about 3521.4347928082. The cubic root of 12400503 is about 231.4620350831.

Adding to 12400503 its reverse (30500421), we get a palindrome (42900924).

The spelling of 12400503 in words is "twelve million, four hundred thousand, five hundred three".