138987980 has 12 divisors (see below), whose sum is σ = 291874800. Its totient is φ = 55595184.

The previous prime is 138987943. The next prime is 138988001. The reversal of 138987980 is 89789831.

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, 3474680 + ... + 3474719.

It is an arithmetic number, because the mean of its divisors is an integer number (24322900).

Almost surely, 2^138987980 is an apocalyptic number.

138987980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138987980 is an abundant number, since it is smaller than the sum of its proper divisors (152886820).

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

138987980 is a wasteful number, since it uses less digits than its factorization.

138987980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949408 (or 6949406 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 138987980 is about 11789.3163499840. The cubic root of 138987980 is about 517.9952146962.

The spelling of 138987980 in words is "one hundred thirty-eight million, nine hundred eighty-seven thousand, nine hundred eighty".