138352178 has 8 divisors (see below), whose sum is σ = 207588972. Its totient is φ = 69155856.

The previous prime is 138352169. The next prime is 138352189. The reversal of 138352178 is 871253831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72369049 + 65983129 = 8507^2 + 8123^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 16652.

Almost surely, 2^138352178 is an apocalyptic number.

138352178 is a deficient number, since it is larger than the sum of its proper divisors (69236794).

138352178 is a wasteful number, since it uses less digits than its factorization.

138352178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20236.

The product of its digits is 40320, while the sum is 38.

The square root of 138352178 is about 11762.3202643016. The cubic root of 138352178 is about 517.2041490057.

The spelling of 138352178 in words is "one hundred thirty-eight million, three hundred fifty-two thousand, one hundred seventy-eight".