19139967987 has 16 divisors (see below), whose sum is σ = 29643793152. Its totient is φ = 10757826720.

The previous prime is 19139967971. The next prime is 19139967991. The reversal of 19139967987 is 78976993191.

It is not a de Polignac number, because 19139967987 - 2⁴ = 19139967971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19139967907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7469433 + ... + 7471994.

It is an arithmetic number, because the mean of its divisors is an integer number (1852737072).

Almost surely, 2^19139967987 is an apocalyptic number.

19139967987 is a deficient number, since it is larger than the sum of its proper divisors (10503825165).

19139967987 is a wasteful number, since it uses less digits than its factorization.

19139967987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14941498.

The product of its digits is 46294416, while the sum is 69.

The spelling of 19139967987 in words is "nineteen billion, one hundred thirty-nine million, nine hundred sixty-seven thousand, nine hundred eighty-seven".