19807975939 has 2 divisors, whose sum is σ = 19807975940. Its totient is φ = 19807975938.

The previous prime is 19807975927. The next prime is 19807975961. The reversal of 19807975939 is 93957970891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19807975939 - 2³³ = 11218041347 is a prime.

It is not a weakly prime, because it can be changed into another prime (19807975909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9903987969 + 9903987970.

It is an arithmetic number, because the mean of its divisors is an integer number (9903987970).

Almost surely, 2^19807975939 is an apocalyptic number.

19807975939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19807975939 is an equidigital number, since it uses as much as digits as its factorization.

19807975939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38578680, while the sum is 67.

The spelling of 19807975939 in words is "nineteen billion, eight hundred seven million, nine hundred seventy-five thousand, nine hundred thirty-nine".