19631689338 has 8 divisors (see below), whose sum is σ = 39263378688. Its totient is φ = 6543896444.

The previous prime is 19631689321. The next prime is 19631689339. The reversal of 19631689338 is 83398613691.

It is a happy number.

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

19631689338 is an admirable number.

It is a super-4 number, since 4×19631689338⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (19631689339) 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, 1635974106 + ... + 1635974117.

It is an arithmetic number, because the mean of its divisors is an integer number (4907922336).

Almost surely, 2^19631689338 is an apocalyptic number.

19631689338 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19631689338 is a wasteful number, since it uses less digits than its factorization.

19631689338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271948228.

The product of its digits is 5038848, while the sum is 57.

The spelling of 19631689338 in words is "nineteen billion, six hundred thirty-one million, six hundred eighty-nine thousand, three hundred thirty-eight".