19840194000 has 640 divisors, whose sum is σ = 78440693760. Its totient is φ = 4753728000.

The previous prime is 19840193987. The next prime is 19840194043. The reversal of 19840194000 is 49104891.

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 127 ways as a sum of consecutive naturals, for example, 75437869 + ... + 75438131.

It is an arithmetic number, because the mean of its divisors is an integer number (122563584).

Almost surely, 2^19840194000 is an apocalyptic number.

19840194000 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 19840194000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39220346880).

19840194000 is an abundant number, since it is smaller than the sum of its proper divisors (58600499760).

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

19840194000 is a wasteful number, since it uses less digits than its factorization.

19840194000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

Adding to 19840194000 its reverse (49104891), we get a palindrome (19889298891).

The spelling of 19840194000 in words is "nineteen billion, eight hundred forty million, one hundred ninety-four thousand".