138903139550 has 36 divisors (see below), whose sum is σ = 300541043160. Its totient is φ = 47623932720.

The previous prime is 138903139549. The next prime is 138903139579. The reversal of 138903139550 is 55931309831.

138903139550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 138903139495 and 138903139504.

It is a congruent number.

It is an unprimeable number.

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 in 17 ways as a sum of consecutive naturals, for example, 28345130 + ... + 28350029.

It is an arithmetic number, because the mean of its divisors is an integer number (8348362310).

Almost surely, 2^138903139550 is an apocalyptic number.

138903139550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138903139550 is an abundant number, since it is smaller than the sum of its proper divisors (161637903610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138903139550 is a wasteful number, since it uses less digits than its factorization.

138903139550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56695185 (or 56695173 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 47.

The spelling of 138903139550 in words is "one hundred thirty-eight billion, nine hundred three million, one hundred thirty-nine thousand, five hundred fifty".