1812204894 has 16 divisors (see below), whose sum is σ = 3626795520. Its totient is φ = 603670680.

The previous prime is 1812204887. The next prime is 1812204931. The reversal of 1812204894 is 4984022181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89454 + ... + 107825.

It is an arithmetic number, because the mean of its divisors is an integer number (226674720).

Almost surely, 2^1812204894 is an apocalyptic number.

1812204894 is an abundant number, since it is smaller than the sum of its proper divisors (1814590626).

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

1812204894 is a wasteful number, since it uses less digits than its factorization.

1812204894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198815.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 1812204894 is about 42569.9999295278. Note that the first 4 decimals coincide. The cubic root of 1812204894 is about 1219.1835651064.

The spelling of 1812204894 in words is "one billion, eight hundred twelve million, two hundred four thousand, eight hundred ninety-four".