12638554 has 4 divisors (see below), whose sum is σ = 18957834. Its totient is φ = 6319276.

The previous prime is 12638551. The next prime is 12638581. The reversal of 12638554 is 45583621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45583621 = 29 ⋅1571849.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 529 = 3555^2 + 23^2 .

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159637 + ... + 3159640.

Almost surely, 2^12638554 is an apocalyptic number.

12638554 is a deficient number, since it is larger than the sum of its proper divisors (6319280).

12638554 is an equidigital number, since it uses as much as digits as its factorization.

12638554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319279.

The product of its digits is 28800, while the sum is 34.

The square root of 12638554 is about 3555.0744014718. The cubic root of 12638554 is about 232.9337737819.

The spelling of 12638554 in words is "twelve million, six hundred thirty-eight thousand, five hundred fifty-four".