18839081389 has 2 divisors, whose sum is σ = 18839081390. Its totient is φ = 18839081388.

The previous prime is 18839081383. The next prime is 18839081407. The reversal of 18839081389 is 98318093881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9853937289 + 8985144100 = 99267^2 + 94790^2 .

It is a cyclic number.

It is not a de Polignac number, because 18839081389 - 2¹¹ = 18839079341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18839081383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419540694 + 9419540695.

It is an arithmetic number, because the mean of its divisors is an integer number (9419540695).

Almost surely, 2^18839081389 is an apocalyptic number.

It is an amenable number.

18839081389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18839081389 is an equidigital number, since it uses as much as digits as its factorization.

18839081389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 58.

The spelling of 18839081389 in words is "eighteen billion, eight hundred thirty-nine million, eighty-one thousand, three hundred eighty-nine".