138904736871 has 8 divisors (see below), whose sum is σ = 185227347184. Its totient is φ = 92592642240.

The previous prime is 138904736857. The next prime is 138904736891. The reversal of 138904736871 is 178637409831.

It is a happy number.

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

It is not a de Polignac number, because 138904736871 - 2¹³ = 138904728679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138904736891) 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, 2598046 + ... + 2650971.

It is an arithmetic number, because the mean of its divisors is an integer number (23153418398).

Almost surely, 2^138904736871 is an apocalyptic number.

138904736871 is a deficient number, since it is larger than the sum of its proper divisors (46322610313).

138904736871 is an equidigital number, since it uses as much as digits as its factorization.

138904736871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257841.

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 138904736871 in words is "one hundred thirty-eight billion, nine hundred four million, seven hundred thirty-six thousand, eight hundred seventy-one".