12138578 has 12 divisors (see below), whose sum is σ = 19342842. Its totient is φ = 5712000.

The previous prime is 12138563. The next prime is 12138589. The reversal of 12138578 is 87583121.

It can be written as a sum of positive squares in 3 ways, for example, as 11404129 + 734449 = 3377^2 + 857^2 .

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 9923 + ... + 11078.

Almost surely, 2^12138578 is an apocalyptic number.

12138578 is a deficient number, since it is larger than the sum of its proper divisors (7204264).

12138578 is a wasteful number, since it uses less digits than its factorization.

12138578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21037 (or 21020 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 12138578 is about 3484.0462109450. The cubic root of 12138578 is about 229.8207677382.

The spelling of 12138578 in words is "twelve million, one hundred thirty-eight thousand, five hundred seventy-eight".