138388256 has 24 divisors (see below), whose sum is σ = 273968604. Its totient is φ = 68808960.

The previous prime is 138388249. The next prime is 138388259. The reversal of 138388256 is 652883831.

It can be written as a sum of positive squares in 2 ways, for example, as 137264656 + 1123600 = 11716^2 + 1060^2 .

It is not an unprimeable number, because it can be changed into a prime (138388259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6155 + ... + 17738.

Almost surely, 2^138388256 is an apocalyptic number.

138388256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138388256 is a deficient number, since it is larger than the sum of its proper divisors (135580348).

138388256 is a wasteful number, since it uses less digits than its factorization.

138388256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24084 (or 24076 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 138388256 is about 11763.8537903189. The cubic root of 138388256 is about 517.2491020857.

The spelling of 138388256 in words is "one hundred thirty-eight million, three hundred eighty-eight thousand, two hundred fifty-six".