1849917905780 has 144 divisors (see below), whose sum is σ = 4720235520000. Its totient is φ = 596454064128.

The previous prime is 1849917905723. The next prime is 1849917905789. The reversal of 1849917905780 is 875097199481.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a self number, because there is not a number n which added to its sum of digits gives 1849917905780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1849917905789) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50516237 + ... + 50552843.

Almost surely, 2^{1849917905780} is an apocalyptic number.

1849917905780 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 1849917905780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2360117760000).

1849917905780 is an abundant number, since it is smaller than the sum of its proper divisors (2870317614220).

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

1849917905780 is a wasteful number, since it uses less digits than its factorization.

1849917905780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37906 (or 37887 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 68.

The spelling of 1849917905780 in words is "one trillion, eight hundred forty-nine billion, nine hundred seventeen million, nine hundred five thousand, seven hundred eighty".