138968920 has 16 divisors (see below), whose sum is σ = 312680160. Its totient is φ = 55587552.

The previous prime is 138968909. The next prime is 138968941. The reversal of 138968920 is 29869831.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1737072 + ... + 1737151.

It is an arithmetic number, because the mean of its divisors is an integer number (19542510).

Almost surely, 2^138968920 is an apocalyptic number.

138968920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138968920 is an abundant number, since it is smaller than the sum of its proper divisors (173711240).

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

138968920 is a wasteful number, since it uses less digits than its factorization.

138968920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3474234 (or 3474230 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 138968920 is about 11788.5079632666. The cubic root of 138968920 is about 517.9715353340.

The spelling of 138968920 in words is "one hundred thirty-eight million, nine hundred sixty-eight thousand, nine hundred twenty".