19450805400 has 480 divisors, whose sum is σ = 76596920400. Its totient is φ = 4534963200.

The previous prime is 19450805359. The next prime is 19450805411. The reversal of 19450805400 is 450805491.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3998970 + ... + 4003830.

Almost surely, 2^19450805400 is an apocalyptic number.

19450805400 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 19450805400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38298460200).

19450805400 is an abundant number, since it is smaller than the sum of its proper divisors (57146115000).

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

19450805400 is a wasteful number, since it uses less digits than its factorization.

19450805400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921 (or 4903 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 19450805400 in words is "nineteen billion, four hundred fifty million, eight hundred five thousand, four hundred".