19031904450 has 192 divisors, whose sum is σ = 56832612480. Its totient is φ = 4655335680.

The previous prime is 19031904421. The next prime is 19031904473. The reversal of 19031904450 is 5440913091.

It is a happy number.

19031904450 is a `hidden beast` number, since 1 + 90 + 31 + 90 + 4 + 450 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2857324 + ... + 2863976.

It is an arithmetic number, because the mean of its divisors is an integer number (296003190).

Almost surely, 2^19031904450 is an apocalyptic number.

19031904450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19031904450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28416306240).

19031904450 is an abundant number, since it is smaller than the sum of its proper divisors (37800708030).

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

19031904450 is a wasteful number, since it uses less digits than its factorization.

19031904450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850 (or 6839 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 19031904450 in words is "nineteen billion, thirty-one million, nine hundred four thousand, four hundred fifty".