138886938 has 24 divisors (see below), whose sum is σ = 301843776. Its totient is φ = 46153800.

The previous prime is 138886933. The next prime is 138887009. The reversal of 138886938 is 839688831.

It is a happy number.

138886938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138886933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5698 + ... + 17613.

It is an arithmetic number, because the mean of its divisors is an integer number (12576824).

Almost surely, 2^138886938 is an apocalyptic number.

138886938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138886938 is an abundant number, since it is smaller than the sum of its proper divisors (162956838).

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

138886938 is a wasteful number, since it uses less digits than its factorization.

138886938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23650 (or 23647 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 138886938 is about 11785.0302502794. The cubic root of 138886938 is about 517.8696595681.

The spelling of 138886938 in words is "one hundred thirty-eight million, eight hundred eighty-six thousand, nine hundred thirty-eight".