1812209789160 has 320 divisors, whose sum is σ = 6285208018320. Its totient is φ = 468023132160.

The previous prime is 1812209789147. The next prime is 1812209789171. The reversal of 1812209789160 is 619879022181.

It is a happy number.

1812209789160 is a `hidden beast` number, since 181 + 220 + 9 + 7 + 89 + 160 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 689673777156 + 1122536012004 = 830466^2 + 1059498^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1812209789097 and 1812209789106.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 18149292 + ... + 18248868.

Almost surely, 2^{1812209789160} is an apocalyptic number.

1812209789160 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 1812209789160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3142604009160).

1812209789160 is an abundant number, since it is smaller than the sum of its proper divisors (4472998229160).

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

1812209789160 is a wasteful number, since it uses less digits than its factorization.

1812209789160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99778 (or 99765 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 1812209789160 in words is "one trillion, eight hundred twelve billion, two hundred nine million, seven hundred eighty-nine thousand, one hundred sixty".