138003538 has 4 divisors (see below), whose sum is σ = 207005310. Its totient is φ = 69001768.

The previous prime is 138003529. The next prime is 138003539. The reversal of 138003538 is 835300831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 128436889 + 9566649 = 11333^2 + 3093^2 .

It is not an unprimeable number, because it can be changed into a prime (138003539) 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 as a sum of consecutive naturals, namely, 34500883 + ... + 34500886.

Almost surely, 2^138003538 is an apocalyptic number.

138003538 is a deficient number, since it is larger than the sum of its proper divisors (69001772).

138003538 is an equidigital number, since it uses as much as digits as its factorization.

138003538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69001771.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 138003538 is about 11747.4907107859. The cubic root of 138003538 is about 516.7693414168.

The spelling of 138003538 in words is "one hundred thirty-eight million, three thousand, five hundred thirty-eight".