19889960638 has 8 divisors (see below), whose sum is σ = 30049581240. Its totient is φ = 9873433560.

The previous prime is 19889960593. The next prime is 19889960639. The reversal of 19889960638 is 83606998891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19889960638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19889960639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35773033 + ... + 35773588.

It is an arithmetic number, because the mean of its divisors is an integer number (3756197655).

Almost surely, 2^19889960638 is an apocalyptic number.

19889960638 is a deficient number, since it is larger than the sum of its proper divisors (10159620602).

19889960638 is a wasteful number, since it uses less digits than its factorization.

19889960638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71546762.

The product of its (nonzero) digits is 40310784, while the sum is 67.

The spelling of 19889960638 in words is "nineteen billion, eight hundred eighty-nine million, nine hundred sixty thousand, six hundred thirty-eight".