138920198399 has 8 divisors (see below), whose sum is σ = 141019357440. Its totient is φ = 136821796056.

The previous prime is 138920198387. The next prime is 138920198437. The reversal of 138920198399 is 993891029831.

It is a Cunningham number, because it is equal to 372720²-1.

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

It is a cyclic number.

It is not a de Polignac number, because 138920198399 - 2⁸ = 138920198143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138920198369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186362 + ... + 559080.

It is an arithmetic number, because the mean of its divisors is an integer number (17627419680).

Almost surely, 2^138920198399 is an apocalyptic number.

138920198399 is a deficient number, since it is larger than the sum of its proper divisors (2099159041).

138920198399 is an equidigital number, since it uses as much as digits as its factorization.

138920198399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378349.

The product of its (nonzero) digits is 7558272, while the sum is 62.

The spelling of 138920198399 in words is "one hundred thirty-eight billion, nine hundred twenty million, one hundred ninety-eight thousand, three hundred ninety-nine".