138655288 has 16 divisors (see below), whose sum is σ = 260153280. Its totient is φ = 69281088.

The previous prime is 138655267. The next prime is 138655291. The reversal of 138655288 is 882556831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9081 + ... + 18967.

It is an arithmetic number, because the mean of its divisors is an integer number (16259580).

Almost surely, 2^138655288 is an apocalyptic number.

It is an amenable number.

138655288 is a deficient number, since it is larger than the sum of its proper divisors (121497992).

138655288 is a wasteful number, since it uses less digits than its factorization.

138655288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11646 (or 11642 counting only the distinct ones).

The product of its digits is 460800, while the sum is 46.

The square root of 138655288 is about 11775.1980025815. The cubic root of 138655288 is about 517.5815804859.

The spelling of 138655288 in words is "one hundred thirty-eight million, six hundred fifty-five thousand, two hundred eighty-eight".