19023819408 has 150 divisors (see below), whose sum is σ = 60521492262. Its totient is φ = 5764746240.

The previous prime is 19023819391. The next prime is 19023819413. The reversal of 19023819408 is 80491832091.

19023819408 is a `hidden beast` number, since 1 + 9 + 0 + 238 + 1 + 9 + 408 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17809436304 + 1214383104 = 133452^2 + 34848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 96160 + ... + 217472.

Almost surely, 2^19023819408 is an apocalyptic number.

19023819408 is a gapful number since it is divisible by the number (18) 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 19023819408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30260746131).

19023819408 is an abundant number, since it is smaller than the sum of its proper divisors (41497672854).

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

19023819408 is a wasteful number, since it uses less digits than its factorization.

19023819408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121355 (or 121329 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 19023819408 in words is "nineteen billion, twenty-three million, eight hundred nineteen thousand, four hundred eight".