138231518 has 8 divisors (see below), whose sum is σ = 216362448. Its totient is φ = 66110704.

The previous prime is 138231491. The next prime is 138231521. The reversal of 138231518 is 815132831.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502471 + ... + 1502562.

It is an arithmetic number, because the mean of its divisors is an integer number (27045306).

Almost surely, 2^138231518 is an apocalyptic number.

138231518 is a deficient number, since it is larger than the sum of its proper divisors (78130930).

138231518 is a wasteful number, since it uses less digits than its factorization.

138231518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005058.

The product of its digits is 5760, while the sum is 32.

The square root of 138231518 is about 11757.1900554512. The cubic root of 138231518 is about 517.0537502090.

The spelling of 138231518 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, five hundred eighteen".