138888518 has 8 divisors (see below), whose sum is σ = 219297720. Its totient is φ = 65789280.

The previous prime is 138888517. The next prime is 138888527. The reversal of 138888518 is 815888831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138888517) 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 3 ways as a sum of consecutive naturals, for example, 1827443 + ... + 1827518.

It is an arithmetic number, because the mean of its divisors is an integer number (27412215).

Almost surely, 2^138888518 is an apocalyptic number.

138888518 is a deficient number, since it is larger than the sum of its proper divisors (80409202).

138888518 is a wasteful number, since it uses less digits than its factorization.

138888518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654982.

The product of its digits is 491520, while the sum is 50.

The square root of 138888518 is about 11785.0972842824. The cubic root of 138888518 is about 517.8716233500.

The spelling of 138888518 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, five hundred eighteen".