138559378 has 8 divisors (see below), whose sum is σ = 207908172. Its totient is φ = 69256656.

The previous prime is 138559273. The next prime is 138559391. The reversal of 138559378 is 873955831.

It can be written as a sum of positive squares in 2 ways, for example, as 137053849 + 1505529 = 11707^2 + 1227^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2625 + ... + 16852.

Almost surely, 2^138559378 is an apocalyptic number.

138559378 is a deficient number, since it is larger than the sum of its proper divisors (69348794).

138559378 is a wasteful number, since it uses less digits than its factorization.

138559378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23036.

The product of its digits is 907200, while the sum is 49.

The square root of 138559378 is about 11771.1247550946. The cubic root of 138559378 is about 517.4622132398.

The spelling of 138559378 in words is "one hundred thirty-eight million, five hundred fifty-nine thousand, three hundred seventy-eight".