19401982387 has 2 divisors, whose sum is σ = 19401982388. Its totient is φ = 19401982386.

The previous prime is 19401982331. The next prime is 19401982393. The reversal of 19401982387 is 78328910491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19401982387 - 2¹⁹ = 19401458099 is a prime.

It is not a weakly prime, because it can be changed into another prime (19401980387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9700991193 + 9700991194.

It is an arithmetic number, because the mean of its divisors is an integer number (9700991194).

Almost surely, 2^19401982387 is an apocalyptic number.

19401982387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19401982387 is an equidigital number, since it uses as much as digits as its factorization.

19401982387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 19401982387 in words is "nineteen billion, four hundred one million, nine hundred eighty-two thousand, three hundred eighty-seven".