19387907938 has 16 divisors (see below), whose sum is σ = 33251526144. Its totient is φ = 8305325280.

The previous prime is 19387907879. The next prime is 19387907947. The reversal of 19387907938 is 83970978391.

It is a self number, because there is not a number n which added to its sum of digits gives 19387907938.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282843 + ... + 344638.

It is an arithmetic number, because the mean of its divisors is an integer number (2078220384).

Almost surely, 2^19387907938 is an apocalyptic number.

19387907938 is a deficient number, since it is larger than the sum of its proper divisors (13863618206).

19387907938 is a wasteful number, since it uses less digits than its factorization.

19387907938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629697.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 19387907938 in words is "nineteen billion, three hundred eighty-seven million, nine hundred seven thousand, nine hundred thirty-eight".