19594040400 has 960 divisors, whose sum is σ = 81303367680. Its totient is φ = 4435200000.

The previous prime is 19594040381. The next prime is 19594040429. The reversal of 19594040400 is 404049591.

It is a happy number.

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 191 ways as a sum of consecutive naturals, for example, 194000350 + ... + 194000450.

It is an arithmetic number, because the mean of its divisors is an integer number (84691008).

Almost surely, 2^19594040400 is an apocalyptic number.

19594040400 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 19594040400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40651683840).

19594040400 is an abundant number, since it is smaller than the sum of its proper divisors (61709327280).

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

19594040400 is a wasteful number, since it uses less digits than its factorization.

19594040400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 19594040400 its reverse (404049591), we get a palindrome (19998089991).

The spelling of 19594040400 in words is "nineteen billion, five hundred ninety-four million, forty thousand, four hundred".