19621487438 has 16 divisors (see below), whose sum is σ = 34110595584. Its totient is φ = 8290768920.

The previous prime is 19621487419. The next prime is 19621487441. The reversal of 19621487438 is 83478412691.

It is a self number, because there is not a number n which added to its sum of digits gives 19621487438.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 9868970 + ... + 9870957.

It is an arithmetic number, because the mean of its divisors is an integer number (2131912224).

Almost surely, 2^19621487438 is an apocalyptic number.

19621487438 is a deficient number, since it is larger than the sum of its proper divisors (14489108146).

19621487438 is a wasteful number, since it uses less digits than its factorization.

19621487438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19740007.

The product of its digits is 2322432, while the sum is 53.

The spelling of 19621487438 in words is "nineteen billion, six hundred twenty-one million, four hundred eighty-seven thousand, four hundred thirty-eight".