12503428 has 18 divisors (see below), whose sum is σ = 25453806. Its totient is φ = 5358528.

The previous prime is 12503423. The next prime is 12503429. The reversal of 12503428 is 82430521.

12503428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12446784 + 56644 = 3528^2 + 238^2 .

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 5 ways as a sum of consecutive naturals, for example, 31701 + ... + 32092.

Almost surely, 2^12503428 is an apocalyptic number.

It is an amenable number.

12503428 is an abundant number, since it is smaller than the sum of its proper divisors (12950378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12503428 is a wasteful number, since it uses less digits than its factorization.

12503428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63811 (or 63802 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 12503428 is about 3536.0186651091. The cubic root of 12503428 is about 232.1006548969.

Adding to 12503428 its reverse (82430521), we get a palindrome (94933949).

The spelling of 12503428 in words is "twelve million, five hundred three thousand, four hundred twenty-eight".