19381940393 has 2 divisors, whose sum is σ = 19381940394. Its totient is φ = 19381940392.

The previous prime is 19381940353. The next prime is 19381940411. The reversal of 19381940393 is 39304918391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19046208064 + 335732329 = 138008^2 + 18323^2 .

It is a cyclic number.

It is not a de Polignac number, because 19381940393 - 2¹² = 19381936297 is a prime.

It is a super-2 number, since 2×19381940393² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19381940353) 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, 9690970196 + 9690970197.

It is an arithmetic number, because the mean of its divisors is an integer number (9690970197).

Almost surely, 2^19381940393 is an apocalyptic number.

It is an amenable number.

19381940393 is a deficient number, since it is larger than the sum of its proper divisors (1).

19381940393 is an equidigital number, since it uses as much as digits as its factorization.

19381940393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 19381940393 in words is "nineteen billion, three hundred eighty-one million, nine hundred forty thousand, three hundred ninety-three".