138920198387 has 2 divisors, whose sum is σ = 138920198388. Its totient is φ = 138920198386.

The previous prime is 138920198381. The next prime is 138920198437. The reversal of 138920198387 is 783891029831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138920198387 - 2¹² = 138920194291 is a prime.

It is not a weakly prime, because it can be changed into another prime (138920198381) 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 as a sum of consecutive naturals, namely, 69460099193 + 69460099194.

It is an arithmetic number, because the mean of its divisors is an integer number (69460099194).

Almost surely, 2^138920198387 is an apocalyptic number.

138920198387 is a deficient number, since it is larger than the sum of its proper divisors (1).

138920198387 is an equidigital number, since it uses as much as digits as its factorization.

138920198387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 138920198387 in words is "one hundred thirty-eight billion, nine hundred twenty million, one hundred ninety-eight thousand, three hundred eighty-seven".