1812843249 has 24 divisors (see below), whose sum is σ = 2880345888. Its totient is φ = 1010640960.

The previous prime is 1812843239. The next prime is 1812843287. The reversal of 1812843249 is 9423482181.

It is not a de Polignac number, because 1812843249 - 2⁷ = 1812843121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1812843249.

It is not an unprimeable number, because it can be changed into a prime (1812843209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144367 + ... + 156420.

It is an arithmetic number, because the mean of its divisors is an integer number (120014412).

Almost surely, 2^1812843249 is an apocalyptic number.

It is an amenable number.

1812843249 is a deficient number, since it is larger than the sum of its proper divisors (1067502639).

1812843249 is a wasteful number, since it uses less digits than its factorization.

1812843249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300845 (or 300838 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 1812843249 is about 42577.4969790381. The cubic root of 1812843249 is about 1219.3267020776.

The spelling of 1812843249 in words is "one billion, eight hundred twelve million, eight hundred forty-three thousand, two hundred forty-nine".