138986128 has 20 divisors (see below), whose sum is σ = 269818668. Its totient is φ = 69355520.

The previous prime is 138986119. The next prime is 138986137. The reversal of 138986128 is 821689831.

138986128 is a nontrivial binomial coefficient, being equal to C(16673, 2).

It is an interprime number because it is at equal distance from previous prime (138986119) and next prime (138986137).

It can be written as a sum of positive squares in 2 ways, for example, as 90098064 + 48888064 = 9492^2 + 6992^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 16672.

Almost surely, 2^138986128 is an apocalyptic number.

138986128 is the 16672-nd triangular number.

138986128 is the 5558-th centered nonagonal number.

It is an amenable number.

138986128 is a deficient number, since it is larger than the sum of its proper divisors (130832540).

138986128 is a wasteful number, since it uses less digits than its factorization.

138986128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17202 (or 17196 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 138986128 is about 11789.2378040313. The cubic root of 138986128 is about 517.9929139423.

The spelling of 138986128 in words is "one hundred thirty-eight million, nine hundred eighty-six thousand, one hundred twenty-eight".