19858783868 has 48 divisors (see below), whose sum is σ = 43431456768. Its totient is φ = 7718760000.

The previous prime is 19858783837. The next prime is 19858783873. The reversal of 19858783868 is 86838785891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53093 + ... + 206243.

It is an arithmetic number, because the mean of its divisors is an integer number (904822016).

Almost surely, 2^19858783868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19858783868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21715728384).

19858783868 is an abundant number, since it is smaller than the sum of its proper divisors (23572672900).

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

19858783868 is a wasteful number, since it uses less digits than its factorization.

19858783868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153594 (or 153592 counting only the distinct ones).

The product of its digits is 185794560, while the sum is 71.

The spelling of 19858783868 in words is "nineteen billion, eight hundred fifty-eight million, seven hundred eighty-three thousand, eight hundred sixty-eight".