19324738638 has 48 divisors (see below), whose sum is σ = 42351828480. Its totient is φ = 6367751568.

The previous prime is 19324738603. The next prime is 19324738639. The reversal of 19324738638 is 83683742391.

19324738638 is a `hidden beast` number, since 1 + 93 + 2 + 473 + 86 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19324738639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 912081 + ... + 933027.

It is an arithmetic number, because the mean of its divisors is an integer number (882329760).

Almost surely, 2^19324738638 is an apocalyptic number.

19324738638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19324738638 is an abundant number, since it is smaller than the sum of its proper divisors (23027089842).

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

19324738638 is a wasteful number, since it uses less digits than its factorization.

19324738638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21541 (or 21538 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 19324738638 in words is "nineteen billion, three hundred twenty-four million, seven hundred thirty-eight thousand, six hundred thirty-eight".