138987867 has 8 divisors (see below), whose sum is σ = 185724496. Its totient is φ = 92454912.

The previous prime is 138987859. The next prime is 138987929. The reversal of 138987867 is 768789831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138987867 - 2³ = 138987859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138987847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49318 + ... + 52059.

It is an arithmetic number, because the mean of its divisors is an integer number (23215562).

Almost surely, 2^138987867 is an apocalyptic number.

138987867 is a deficient number, since it is larger than the sum of its proper divisors (46736629).

138987867 is a wasteful number, since it uses less digits than its factorization.

138987867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101837.

The product of its digits is 4064256, while the sum is 57.

The square root of 138987867 is about 11789.3115575084. The cubic root of 138987867 is about 517.9950743160.

The spelling of 138987867 in words is "one hundred thirty-eight million, nine hundred eighty-seven thousand, eight hundred sixty-seven".