1804861440000 has 1100 divisors, whose sum is σ = 7134584900454. Its totient is φ = 452984832000.

The previous prime is 1804861439989. The next prime is 1804861440001. The reversal of 1804861440000 is 441684081.

It can be written as a sum of positive squares in 5 ways, for example, as 116275544064 + 1688585895936 = 340992^2 + 1299456^2 .

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

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 16320 × 14400 × 7680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804861440001) by changing a digit.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 106168319992 + ... + 106168320008.

Almost surely, 2^{1804861440000} is an apocalyptic number.

1804861440000 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 1804861440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3567292450227).

1804861440000 is an abundant number, since it is smaller than the sum of its proper divisors (5329723460454).

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

1804861440000 is an frugal number, since it uses more digits than its factorization.

1804861440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 1804861440000 in words is "one trillion, eight hundred four billion, eight hundred sixty-one million, four hundred forty thousand".