138394538 has 8 divisors (see below), whose sum is σ = 207658080. Its totient is φ = 69175180.

The previous prime is 138394517. The next prime is 138394559. The reversal of 138394538 is 835493831.

It is an interprime number because it is at equal distance from previous prime (138394517) and next prime (138394559).

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

It is a Curzon 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, 1598 + ... + 16713.

It is an arithmetic number, because the mean of its divisors is an integer number (25957260).

Almost surely, 2^138394538 is an apocalyptic number.

138394538 is a deficient number, since it is larger than the sum of its proper divisors (69263542).

138394538 is a wasteful number, since it uses less digits than its factorization.

138394538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22092.

The product of its digits is 311040, while the sum is 44.

The square root of 138394538 is about 11764.1207916274. The cubic root of 138394538 is about 517.2569286402.

The spelling of 138394538 in words is "one hundred thirty-eight million, three hundred ninety-four thousand, five hundred thirty-eight".