138911385 has 16 divisors (see below), whose sum is σ = 222546240. Its totient is φ = 73990080.

The previous prime is 138911351. The next prime is 138911401. The reversal of 138911385 is 583119831.

138911385 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 138911385 - 2⁹ = 138910873 is a prime.

It is a Curzon 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, 6850 + ... + 18020.

It is an arithmetic number, because the mean of its divisors is an integer number (13909140).

Almost surely, 2^138911385 is an apocalyptic number.

138911385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138911385 is a deficient number, since it is larger than the sum of its proper divisors (83634855).

138911385 is a wasteful number, since it uses less digits than its factorization.

138911385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12008.

The product of its digits is 25920, while the sum is 39.

The square root of 138911385 is about 11786.0674102942. The cubic root of 138911385 is about 517.9000430753.

The spelling of 138911385 in words is "one hundred thirty-eight million, nine hundred eleven thousand, three hundred eighty-five".