1812641236 has 48 divisors (see below), whose sum is σ = 3668797440. Its totient is φ = 767576160.

The previous prime is 1812641227. The next prime is 1812641239. The reversal of 1812641236 is 6321462181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812641239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963745 + ... + 965623.

It is an arithmetic number, because the mean of its divisors is an integer number (76433280).

Almost surely, 2^1812641236 is an apocalyptic number.

It is an amenable number.

1812641236 is an abundant number, since it is smaller than the sum of its proper divisors (1856156204).

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

1812641236 is a wasteful number, since it uses less digits than its factorization.

1812641236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284 (or 2282 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 1812641236 is about 42575.1246152022. The cubic root of 1812641236 is about 1219.2814087711.

The spelling of 1812641236 in words is "one billion, eight hundred twelve million, six hundred forty-one thousand, two hundred thirty-six".