138923560378 has 4 divisors (see below), whose sum is σ = 208385340570. Its totient is φ = 69461780188.

The previous prime is 138923560357. The next prime is 138923560379. The reversal of 138923560378 is 873065329831.

138923560378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873065329831 = 10979 ⋅79521389.

It can be written as a sum of positive squares in only one way, i.e., 112169396889 + 26754163489 = 334917^2 + 163567^2 .

It is not an unprimeable number, because it can be changed into a prime (138923560379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34730890093 + ... + 34730890096.

Almost surely, 2^138923560378 is an apocalyptic number.

138923560378 is a deficient number, since it is larger than the sum of its proper divisors (69461780192).

138923560378 is an equidigital number, since it uses as much as digits as its factorization.

138923560378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69461780191.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 138923560378 in words is "one hundred thirty-eight billion, nine hundred twenty-three million, five hundred sixty thousand, three hundred seventy-eight".