138917871045 has 80 divisors (see below), whose sum is σ = 251166960000. Its totient is φ = 73453640832.

The previous prime is 138917871023. The next prime is 138917871047. The reversal of 138917871045 is 540178719831.

It is not a de Polignac number, because 138917871045 - 2¹⁵ = 138917838277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138917870982 and 138917871000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138917871047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 37351696 + ... + 37355414.

It is an arithmetic number, because the mean of its divisors is an integer number (3139587000).

Almost surely, 2^138917871045 is an apocalyptic number.

138917871045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138917871045 is a deficient number, since it is larger than the sum of its proper divisors (112249088955).

138917871045 is a wasteful number, since it uses less digits than its factorization.

138917871045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 54.

The spelling of 138917871045 in words is "one hundred thirty-eight billion, nine hundred seventeen million, eight hundred seventy-one thousand, forty-five".