138888308 has 48 divisors (see below), whose sum is σ = 279605760. Its totient is φ = 59875200.

The previous prime is 138888307. The next prime is 138888319. The reversal of 138888308 is 803888831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138888307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45263 + ... + 48233.

It is an arithmetic number, because the mean of its divisors is an integer number (5825120).

Almost surely, 2^138888308 is an apocalyptic number.

It is an amenable number.

138888308 is an abundant number, since it is smaller than the sum of its proper divisors (140717452).

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

138888308 is a wasteful number, since it uses less digits than its factorization.

138888308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048 (or 3046 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 47.

The square root of 138888308 is about 11785.0883747217. The cubic root of 138888308 is about 517.8713623419.

The spelling of 138888308 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, three hundred eight".