13887638 has 4 divisors (see below), whose sum is σ = 20831460. Its totient is φ = 6943818.

The previous prime is 13887611. The next prime is 13887641. The reversal of 13887638 is 83678831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83678831 = 19 ⋅4404149.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3471908 + ... + 3471911.

It is an arithmetic number, because the mean of its divisors is an integer number (5207865).

Almost surely, 2^13887638 is an apocalyptic number.

13887638 is a deficient number, since it is larger than the sum of its proper divisors (6943822).

13887638 is an equidigital number, since it uses as much as digits as its factorization.

13887638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6943821.

The product of its digits is 193536, while the sum is 44.

The square root of 13887638 is about 3726.6121343655. The cubic root of 13887638 is about 240.3677117921.

The spelling of 13887638 in words is "thirteen million, eight hundred eighty-seven thousand, six hundred thirty-eight".