138268389 has 16 divisors (see below), whose sum is σ = 210862080. Its totient is φ = 78947760.

The previous prime is 138268379. The next prime is 138268391. The reversal of 138268389 is 983862831.

It is not a de Polignac number, because 138268389 - 2⁵ = 138268357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138268309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42772 + ... + 45890.

It is an arithmetic number, because the mean of its divisors is an integer number (13178880).

Almost surely, 2^138268389 is an apocalyptic number.

It is an amenable number.

138268389 is a deficient number, since it is larger than the sum of its proper divisors (72593691).

138268389 is a wasteful number, since it uses less digits than its factorization.

138268389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240.

The product of its digits is 497664, while the sum is 48.

The square root of 138268389 is about 11758.7579701259. The cubic root of 138268389 is about 517.0997180036.

The spelling of 138268389 in words is "one hundred thirty-eight million, two hundred sixty-eight thousand, three hundred eighty-nine".