12638555 has 8 divisors (see below), whose sum is σ = 15219792. Its totient is φ = 10075168.

The previous prime is 12638551. The next prime is 12638581. The reversal of 12638555 is 55583621.

12638555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12638555 - 2² = 12638551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12638551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2849 + ... + 5778.

It is an arithmetic number, because the mean of its divisors is an integer number (1902474).

Almost surely, 2^12638555 is an apocalyptic number.

12638555 is a deficient number, since it is larger than the sum of its proper divisors (2581237).

12638555 is an equidigital number, since it uses as much as digits as its factorization.

12638555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8925.

The product of its digits is 36000, while the sum is 35.

The square root of 12638555 is about 3555.0745421158. The cubic root of 12638555 is about 232.9337799254.

The spelling of 12638555 in words is "twelve million, six hundred thirty-eight thousand, five hundred fifty-five".