138943984 has 20 divisors (see below), whose sum is σ = 277888960. Its totient is φ = 67230720.

The previous prime is 138943967. The next prime is 138943993. The reversal of 138943984 is 489349831.

138943984 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139569 + ... + 140560.

It is an arithmetic number, because the mean of its divisors is an integer number (13894448).

Almost surely, 2^138943984 is an apocalyptic number.

It is an amenable number.

138943984 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138943984 is a wasteful number, since it uses less digits than its factorization.

138943984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280168 (or 280162 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 138943984 is about 11787.4502756109. The cubic root of 138943984 is about 517.9405526011.

The spelling of 138943984 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, nine hundred eighty-four".