19099989840 has 40 divisors (see below), whose sum is σ = 59209969248. Its totient is φ = 5093330560.

The previous prime is 19099989833. The next prime is 19099989841. The reversal of 19099989840 is 4898999091.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×19099989840² (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 (19099989841) 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 7 ways as a sum of consecutive naturals, for example, 39791406 + ... + 39791885.

Almost surely, 2^19099989840 is an apocalyptic number.

19099989840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19099989840 is an abundant number, since it is smaller than the sum of its proper divisors (40109979408).

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

19099989840 is a wasteful number, since it uses less digits than its factorization.

19099989840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79583307 (or 79583301 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 66.

The spelling of 19099989840 in words is "nineteen billion, ninety-nine million, nine hundred eighty-nine thousand, eight hundred forty".