19493839492 has 24 divisors (see below), whose sum is σ = 35235809280. Its totient is φ = 9426842880.

The previous prime is 19493839471. The next prime is 19493839493. The reversal of 19493839492 is 29493839491.

It is a self number, because there is not a number n which added to its sum of digits gives 19493839492.

It is not an unprimeable number, because it can be changed into a prime (19493839493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164109 + ... + 256747.

It is an arithmetic number, because the mean of its divisors is an integer number (1468158720).

Almost surely, 2^19493839492 is an apocalyptic number.

It is an amenable number.

19493839492 is a deficient number, since it is larger than the sum of its proper divisors (15741969788).

19493839492 is a wasteful number, since it uses less digits than its factorization.

19493839492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94371 (or 94369 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 61.

Subtracting 19493839492 from its reverse (29493839491), we obtain a palindrome (9999999999).

The spelling of 19493839492 in words is "nineteen billion, four hundred ninety-three million, eight hundred thirty-nine thousand, four hundred ninety-two".