27138638 has 16 divisors (see below), whose sum is σ = 42018480. Its totient is φ = 13137600.

The previous prime is 27138637. The next prime is 27138653. The reversal of 27138638 is 83683172.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27138637) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 10208 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (2626155).

Almost surely, 2^27138638 is an apocalyptic number.

27138638 is a deficient number, since it is larger than the sum of its proper divisors (14879842).

27138638 is a wasteful number, since it uses less digits than its factorization.

27138638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its digits is 48384, while the sum is 38.

The square root of 27138638 is about 5209.4757893669. The cubic root of 27138638 is about 300.5125977205.

The spelling of 27138638 in words is "twenty-seven million, one hundred thirty-eight thousand, six hundred thirty-eight".