138540085 has 16 divisors (see below), whose sum is σ = 172039680. Its totient is φ = 106989120.

The previous prime is 138540041. The next prime is 138540133. The reversal of 138540085 is 580045831.

It is not a de Polignac number, because 138540085 - 2¹³ = 138531893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138540085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80211 + ... + 81919.

It is an arithmetic number, because the mean of its divisors is an integer number (10752480).

Almost surely, 2^138540085 is an apocalyptic number.

It is an amenable number.

138540085 is a deficient number, since it is larger than the sum of its proper divisors (33499595).

138540085 is a wasteful number, since it uses less digits than its factorization.

138540085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 138540085 is about 11770.3052211912. The cubic root of 138540085 is about 517.4381949885.

The spelling of 138540085 in words is "one hundred thirty-eight million, five hundred forty thousand, eighty-five".