1812561882 has 16 divisors (see below), whose sum is σ = 3625553280. Its totient is φ = 604115712.

The previous prime is 1812561853. The next prime is 1812561887. The reversal of 1812561882 is 2881652181.

It is not an unprimeable number, because it can be changed into a prime (1812561887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70719 + ... + 92877.

It is an arithmetic number, because the mean of its divisors is an integer number (226597080).

Almost surely, 2^1812561882 is an apocalyptic number.

1812561882 is an abundant number, since it is smaller than the sum of its proper divisors (1812991398).

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

1812561882 is a wasteful number, since it uses less digits than its factorization.

1812561882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35797.

The product of its digits is 61440, while the sum is 42.

The square root of 1812561882 is about 42574.1926758453. The cubic root of 1812561882 is about 1219.2636159012.

The spelling of 1812561882 in words is "one billion, eight hundred twelve million, five hundred sixty-one thousand, eight hundred eighty-two".