19400454450 has 384 divisors, whose sum is σ = 61508563200. Its totient is φ = 4456581120.

The previous prime is 19400454419. The next prime is 19400454487. The reversal of 19400454450 is 5445400491.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 24341452 + ... + 24342248.

It is an arithmetic number, because the mean of its divisors is an integer number (160178550).

Almost surely, 2^19400454450 is an apocalyptic number.

19400454450 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 19400454450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30754281600).

19400454450 is an abundant number, since it is smaller than the sum of its proper divisors (42108108750).

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

19400454450 is a wasteful number, since it uses less digits than its factorization.

19400454450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 19400454450 in words is "nineteen billion, four hundred million, four hundred fifty-four thousand, four hundred fifty".