138259385 has 32 divisors (see below), whose sum is σ = 198288000. Its totient is φ = 91356160.

The previous prime is 138259379. The next prime is 138259393. The reversal of 138259385 is 583952831.

It is not a de Polignac number, because 138259385 - 2⁴ = 138259369 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24566 + ... + 29664.

It is an arithmetic number, because the mean of its divisors is an integer number (6196500).

Almost surely, 2^138259385 is an apocalyptic number.

It is an amenable number.

138259385 is a deficient number, since it is larger than the sum of its proper divisors (60028615).

138259385 is a wasteful number, since it uses less digits than its factorization.

138259385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5161.

The product of its digits is 259200, while the sum is 44.

The square root of 138259385 is about 11758.3751003274. The cubic root of 138259385 is about 517.0884932954.

The spelling of 138259385 in words is "one hundred thirty-eight million, two hundred fifty-nine thousand, three hundred eighty-five".