138780085 has 16 divisors (see below), whose sum is σ = 175786560. Its totient is φ = 104889600.

The previous prime is 138780077. The next prime is 138780101. The reversal of 138780085 is 580087831.

138780085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138780085 - 2³ = 138780077 is a prime.

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, 36274 + ... + 39916.

It is an arithmetic number, because the mean of its divisors is an integer number (10986660).

Almost surely, 2^138780085 is an apocalyptic number.

It is an amenable number.

138780085 is a deficient number, since it is larger than the sum of its proper divisors (37006475).

138780085 is a wasteful number, since it uses less digits than its factorization.

138780085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 138780085 is about 11780.4959573016. The cubic root of 138780085 is about 517.7368174052.

The spelling of 138780085 in words is "one hundred thirty-eight million, seven hundred eighty thousand, eighty-five".