12638320 has 40 divisors (see below), whose sum is σ = 29551680. Its totient is φ = 5026560.

The previous prime is 12638309. The next prime is 12638333. The reversal of 12638320 is 2383621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18790 + ... + 19450.

It is an arithmetic number, because the mean of its divisors is an integer number (738792).

Almost surely, 2^12638320 is an apocalyptic number.

12638320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638320 is an abundant number, since it is smaller than the sum of its proper divisors (16913360).

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

12638320 is a wasteful number, since it uses less digits than its factorization.

12638320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 12638320 is about 3555.0414906158. The cubic root of 12638320 is about 232.9323362008.

The spelling of 12638320 in words is "twelve million, six hundred thirty-eight thousand, three hundred twenty".