138355828 has 24 divisors (see below), whose sum is σ = 261097088. Its totient is φ = 63770976.

The previous prime is 138355807. The next prime is 138355829. The reversal of 138355828 is 828553831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138355829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54025 + ... + 56527.

Almost surely, 2^138355828 is an apocalyptic number.

It is an amenable number.

138355828 is a deficient number, since it is larger than the sum of its proper divisors (122741260).

138355828 is a wasteful number, since it uses less digits than its factorization.

138355828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583 (or 3581 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 138355828 is about 11762.4754197405. The cubic root of 138355828 is about 517.2086972501.

The spelling of 138355828 in words is "one hundred thirty-eight million, three hundred fifty-five thousand, eight hundred twenty-eight".