19128931440 has 160 divisors (see below), whose sum is σ = 60418085376. Its totient is φ = 5005255680.

The previous prime is 19128931429. The next prime is 19128931457. The reversal of 19128931440 is 4413982191.

It is a junction number, because it is equal to n+sod(n) for n = 19128931392 and 19128931401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7128339 + ... + 7131021.

Almost surely, 2^19128931440 is an apocalyptic number.

19128931440 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 19128931440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30209042688).

19128931440 is an abundant number, since it is smaller than the sum of its proper divisors (41289153936).

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

19128931440 is a wasteful number, since it uses less digits than its factorization.

19128931440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247 (or 3241 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 19128931440 in words is "nineteen billion, one hundred twenty-eight million, nine hundred thirty-one thousand, four hundred forty".