138588394 has 16 divisors (see below), whose sum is σ = 250084800. Its totient is φ = 56268864.

The previous prime is 138588391. The next prime is 138588473. The reversal of 138588394 is 493885831.

It is not an unprimeable number, because it can be changed into a prime (138588391) 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 7 ways as a sum of consecutive naturals, for example, 260239 + ... + 260770.

It is an arithmetic number, because the mean of its divisors is an integer number (15630300).

Almost surely, 2^138588394 is an apocalyptic number.

138588394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138588394 is a deficient number, since it is larger than the sum of its proper divisors (111496406).

138588394 is a wasteful number, since it uses less digits than its factorization.

138588394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521037.

The product of its digits is 829440, while the sum is 49.

The square root of 138588394 is about 11772.3571981146. The cubic root of 138588394 is about 517.4983316554.

The spelling of 138588394 in words is "one hundred thirty-eight million, five hundred eighty-eight thousand, three hundred ninety-four".