19364643900 has 432 divisors, whose sum is σ = 75031197696. Its totient is φ = 4076144640.

The previous prime is 19364643899. The next prime is 19364643931. The reversal of 19364643900 is 934646391.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5031777 + ... + 5035623.

It is an arithmetic number, because the mean of its divisors is an integer number (173683328).

Almost surely, 2^19364643900 is an apocalyptic number.

19364643900 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 19364643900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37515598848).

19364643900 is an abundant number, since it is smaller than the sum of its proper divisors (55666553796).

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

19364643900 is a wasteful number, since it uses less digits than its factorization.

19364643900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938 (or 3928 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 19364643900 in words is "nineteen billion, three hundred sixty-four million, six hundred forty-three thousand, nine hundred".