19435989438 has 12 divisors (see below), whose sum is σ = 42111310488. Its totient is φ = 6478663140.

The previous prime is 19435989421. The next prime is 19435989451. The reversal of 19435989438 is 83498953491.

19435989438 is a `hidden beast` number, since 1 + 9 + 4 + 3 + 598 + 9 + 4 + 38 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 539888578 + ... + 539888613.

It is an arithmetic number, because the mean of its divisors is an integer number (3509275874).

Almost surely, 2^19435989438 is an apocalyptic number.

19435989438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19435989438 is an abundant number, since it is smaller than the sum of its proper divisors (22675321050).

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

19435989438 is a wasteful number, since it uses less digits than its factorization.

19435989438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079777199 (or 1079777196 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 19435989438 in words is "nineteen billion, four hundred thirty-five million, nine hundred eighty-nine thousand, four hundred thirty-eight".