19239631890 has 64 divisors (see below), whose sum is σ = 47267974656. Its totient is φ = 5009651712.

The previous prime is 19239631847. The next prime is 19239631891. The reversal of 19239631890 is 9813693291.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19239631891) 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 31 ways as a sum of consecutive naturals, for example, 594774 + ... + 626286.

It is an arithmetic number, because the mean of its divisors is an integer number (738562104).

Almost surely, 2^19239631890 is an apocalyptic number.

19239631890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19239631890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23633987328).

19239631890 is an abundant number, since it is smaller than the sum of its proper divisors (28028342766).

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

19239631890 is a wasteful number, since it uses less digits than its factorization.

19239631890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32003.

The product of its (nonzero) digits is 629856, while the sum is 51.

The spelling of 19239631890 in words is "nineteen billion, two hundred thirty-nine million, six hundred thirty-one thousand, eight hundred ninety".