138798019 has 2 divisors, whose sum is σ = 138798020. Its totient is φ = 138798018.

The previous prime is 138798007. The next prime is 138798041. The reversal of 138798019 is 910897831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138798019 - 2¹¹ = 138795971 is a prime.

It is a super-2 number, since 2×138798019² = 38529780156648722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138798019.

It is not a weakly prime, because it can be changed into another prime (138793019) 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, 69399009 + 69399010.

It is an arithmetic number, because the mean of its divisors is an integer number (69399010).

Almost surely, 2^138798019 is an apocalyptic number.

138798019 is a deficient number, since it is larger than the sum of its proper divisors (1).

138798019 is an equidigital number, since it uses as much as digits as its factorization.

138798019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 138798019 is about 11781.2571060987. The cubic root of 138798019 is about 517.7591181365.

The spelling of 138798019 in words is "one hundred thirty-eight million, seven hundred ninety-eight thousand, nineteen".