138139698 has 16 divisors (see below), whose sum is σ = 277333056. Its totient is φ = 45870960.

The previous prime is 138139681. The next prime is 138139699. The reversal of 138139698 is 896931831.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138139699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42193 + ... + 45348.

It is an arithmetic number, because the mean of its divisors is an integer number (17333316).

Almost surely, 2^138139698 is an apocalyptic number.

138139698 is an abundant number, since it is smaller than the sum of its proper divisors (139193358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138139698 is a wasteful number, since it uses less digits than its factorization.

138139698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87809.

The product of its digits is 279936, while the sum is 48.

The square root of 138139698 is about 11753.2845621979. The cubic root of 138139698 is about 516.9392408896.

The spelling of 138139698 in words is "one hundred thirty-eight million, one hundred thirty-nine thousand, six hundred ninety-eight".