138908892 has 48 divisors (see below), whose sum is σ = 340300800. Its totient is φ = 44042880.

The previous prime is 138908879. The next prime is 138908893. The reversal of 138908892 is 298809831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138908893) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 18784 + ... + 25112.

It is an arithmetic number, because the mean of its divisors is an integer number (7089600).

Almost surely, 2^138908892 is an apocalyptic number.

138908892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138908892 is an abundant number, since it is smaller than the sum of its proper divisors (201391908).

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

138908892 is a wasteful number, since it uses less digits than its factorization.

138908892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6426 (or 6424 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 138908892 is about 11785.9616493522. The cubic root of 138908892 is about 517.8969448590.

The spelling of 138908892 in words is "one hundred thirty-eight million, nine hundred eight thousand, eight hundred ninety-two".