19203540312 has 128 divisors (see below), whose sum is σ = 56475014400. Its totient is φ = 5378457600.

The previous prime is 19203540277. The next prime is 19203540313. The reversal of 19203540312 is 21304530291.

It is a self number, because there is not a number n which added to its sum of digits gives 19203540312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19203540313) 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, 158968 + ... + 252344.

It is an arithmetic number, because the mean of its divisors is an integer number (441211050).

Almost surely, 2^19203540312 is an apocalyptic number.

19203540312 is a gapful number since it is divisible by the number (12) 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 19203540312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28237507200).

19203540312 is an abundant number, since it is smaller than the sum of its proper divisors (37271474088).

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

19203540312 is a wasteful number, since it uses less digits than its factorization.

19203540312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93457 (or 93453 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 19203540312 in words is "nineteen billion, two hundred three million, five hundred forty thousand, three hundred twelve".