138656256 has 40 divisors (see below), whose sum is σ = 369393024. Its totient is φ = 46218240.

The previous prime is 138656249. The next prime is 138656257. The reversal of 138656256 is 652656831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138656257) 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, 43600 + ... + 46671.

Almost surely, 2^138656256 is an apocalyptic number.

138656256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138656256 is an abundant number, since it is smaller than the sum of its proper divisors (230736768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138656256 is an frugal number, since it uses more digits than its factorization.

138656256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90292 (or 90276 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 138656256 is about 11775.2391058526. The cubic root of 138656256 is about 517.5827849544.

The spelling of 138656256 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, two hundred fifty-six".