138268387 has 8 divisors (see below), whose sum is σ = 144410400. Its totient is φ = 132137280.

The previous prime is 138268379. The next prime is 138268391. The reversal of 138268387 is 783862831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138268387 - 2³ = 138268379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138268337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33687 + ... + 37567.

It is an arithmetic number, because the mean of its divisors is an integer number (18051300).

Almost surely, 2^138268387 is an apocalyptic number.

138268387 is a deficient number, since it is larger than the sum of its proper divisors (6142013).

138268387 is a wasteful number, since it uses less digits than its factorization.

138268387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453.

The product of its digits is 387072, while the sum is 46.

The square root of 138268387 is about 11758.7578850829. The cubic root of 138268387 is about 517.0997155103.

The spelling of 138268387 in words is "one hundred thirty-eight million, two hundred sixty-eight thousand, three hundred eighty-seven".