1785994421000 has 128 divisors (see below), whose sum is σ = 4296157781760. Its totient is φ = 694685376000.

The previous prime is 1785994420999. The next prime is 1785994421009. The reversal of 1785994421000 is 1244995871.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a self number, because there is not a number n which added to its sum of digits gives 1785994421000.

It is not an unprimeable number, because it can be changed into a prime (1785994421009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5010707 + ... + 5355293.

It is an arithmetic number, because the mean of its divisors is an integer number (33563732670).

Almost surely, 2^{1785994421000} is an apocalyptic number.

1785994421000 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 1785994421000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2148078890880).

1785994421000 is an abundant number, since it is smaller than the sum of its proper divisors (2510163360760).

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

1785994421000 is a wasteful number, since it uses less digits than its factorization.

1785994421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344752 (or 344738 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 1785994421000 in words is "one trillion, seven hundred eighty-five billion, nine hundred ninety-four million, four hundred twenty-one thousand".