138358908 has 24 divisors (see below), whose sum is σ = 358708560. Its totient is φ = 46119600.

The previous prime is 138358897. The next prime is 138358933. The reversal of 138358908 is 809853831.

138358908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640443 + ... + 640658.

It is an arithmetic number, because the mean of its divisors is an integer number (14946190).

Almost surely, 2^138358908 is an apocalyptic number.

138358908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138358908 is an abundant number, since it is smaller than the sum of its proper divisors (220349652).

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

138358908 is a wasteful number, since it uses less digits than its factorization.

138358908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281114 (or 1281106 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 138358908 is about 11762.6063438338. The cubic root of 138358908 is about 517.2125351584.

The spelling of 138358908 in words is "one hundred thirty-eight million, three hundred fifty-eight thousand, nine hundred eight".