19912839000 has 256 divisors, whose sum is σ = 64338019200. Its totient is φ = 5124096000.

The previous prime is 19912838999. The next prime is 19912839013. The reversal of 19912839000 is 93821991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11930166 + ... + 11931834.

Almost surely, 2^19912839000 is an apocalyptic number.

19912839000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19912839000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32169009600).

19912839000 is an abundant number, since it is smaller than the sum of its proper divisors (44425180200).

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

19912839000 is a wasteful number, since it uses less digits than its factorization.

19912839000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 19912839000 in words is "nineteen billion, nine hundred twelve million, eight hundred thirty-nine thousand".