138502438 has 8 divisors (see below), whose sum is σ = 218688120. Its totient is φ = 65606400.

The previous prime is 138502421. The next prime is 138502439. The reversal of 138502438 is 834205831.

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 (138502439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822363 + ... + 1822438.

It is an arithmetic number, because the mean of its divisors is an integer number (27336015).

Almost surely, 2^138502438 is an apocalyptic number.

138502438 is a deficient number, since it is larger than the sum of its proper divisors (80185682).

138502438 is a wasteful number, since it uses less digits than its factorization.

138502438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644822.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 138502438 is about 11768.7058761786. The cubic root of 138502438 is about 517.3913210446.

The spelling of 138502438 in words is "one hundred thirty-eight million, five hundred two thousand, four hundred thirty-eight".