138929487 has 16 divisors (see below), whose sum is σ = 191009280. Its totient is φ = 89754912.

The previous prime is 138929477. The next prime is 138929489. The reversal of 138929487 is 784929831.

It is not a de Polignac number, because 138929487 - 2⁷ = 138929359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138929489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26814 + ... + 31572.

It is an arithmetic number, because the mean of its divisors is an integer number (11938080).

Almost surely, 2^138929487 is an apocalyptic number.

138929487 is a deficient number, since it is larger than the sum of its proper divisors (52079793).

138929487 is a wasteful number, since it uses less digits than its factorization.

138929487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062.

The product of its digits is 870912, while the sum is 51.

The square root of 138929487 is about 11786.8353259049. The cubic root of 138929487 is about 517.9225385181.

It can be divided in two parts, 1389 and 29487, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 138929487 in words is "one hundred thirty-eight million, nine hundred twenty-nine thousand, four hundred eighty-seven".