138920198437 has 2 divisors, whose sum is σ = 138920198438. Its totient is φ = 138920198436.

The previous prime is 138920198387. The next prime is 138920198471. The reversal of 138920198437 is 734891029831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138716022916 + 204175521 = 372446^2 + 14289^2 .

It is a cyclic number.

It is not a de Polignac number, because 138920198437 - 2²⁷ = 138785980709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138920198737) 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, 69460099218 + 69460099219.

It is an arithmetic number, because the mean of its divisors is an integer number (69460099219).

Almost surely, 2^138920198437 is an apocalyptic number.

It is an amenable number.

138920198437 is a deficient number, since it is larger than the sum of its proper divisors (1).

138920198437 is an equidigital number, since it uses as much as digits as its factorization.

138920198437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 138920198437 in words is "one hundred thirty-eight billion, nine hundred twenty million, one hundred ninety-eight thousand, four hundred thirty-seven".