19140381918 has 128 divisors (see below), whose sum is σ = 51649228800. Its totient is φ = 5132229984.

The previous prime is 19140381917. The next prime is 19140381941. The reversal of 19140381918 is 81918304191.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19140381917) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 756021 + ... + 780927.

It is an arithmetic number, because the mean of its divisors is an integer number (403509600).

Almost surely, 2^19140381918 is an apocalyptic number.

19140381918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19140381918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25824614400).

19140381918 is an abundant number, since it is smaller than the sum of its proper divisors (32508846882).

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

19140381918 is a wasteful number, since it uses less digits than its factorization.

19140381918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25051 (or 25045 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The spelling of 19140381918 in words is "nineteen billion, one hundred forty million, three hundred eighty-one thousand, nine hundred eighteen".