19191510940 has 192 divisors, whose sum is σ = 48450576384. Its totient is φ = 6249664512.

The previous prime is 19191510929. The next prime is 19191510967. The reversal of 19191510940 is 4901519191.

It is a junction number, because it is equal to n+sod(n) for n = 19191510893 and 19191510902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39407377 + ... + 39407863.

It is an arithmetic number, because the mean of its divisors is an integer number (252346752).

Almost surely, 2^19191510940 is an apocalyptic number.

19191510940 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 19191510940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24225288192).

19191510940 is an abundant number, since it is smaller than the sum of its proper divisors (29259065444).

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

19191510940 is a wasteful number, since it uses less digits than its factorization.

19191510940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 40.

The spelling of 19191510940 in words is "nineteen billion, one hundred ninety-one million, five hundred ten thousand, nine hundred forty".