138969984 has 32 divisors (see below), whose sum is σ = 369140040. Its totient is φ = 46323200.

The previous prime is 138969967. The next prime is 138970021. The reversal of 138969984 is 489969831.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180567 + ... + 181334.

Almost surely, 2^138969984 is an apocalyptic number.

It is an amenable number.

138969984 is an abundant number, since it is smaller than the sum of its proper divisors (230170056).

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

138969984 is an equidigital number, since it uses as much as digits as its factorization.

138969984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361918 (or 361906 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The square root of 138969984 is about 11788.5530918769. The cubic root of 138969984 is about 517.9728572611.

The spelling of 138969984 in words is "one hundred thirty-eight million, nine hundred sixty-nine thousand, nine hundred eighty-four".