1812378041 has 4 divisors (see below), whose sum is σ = 1918988532. Its totient is φ = 1705767552.

The previous prime is 1812378031. The next prime is 1812378047. The reversal of 1812378041 is 1408732181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1408732181 = 19 ⋅74143799.

It can be written as a sum of positive squares in 2 ways, for example, as 580087225 + 1232290816 = 24085^2 + 35104^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812378041 - 2²² = 1808183737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1812377992 and 1812378010.

It is not an unprimeable number, because it can be changed into a prime (1812378047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53305220 + ... + 53305253.

It is an arithmetic number, because the mean of its divisors is an integer number (479747133).

Almost surely, 2^1812378041 is an apocalyptic number.

It is an amenable number.

1812378041 is a deficient number, since it is larger than the sum of its proper divisors (106610491).

1812378041 is a wasteful number, since it uses less digits than its factorization.

1812378041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106610490.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 1812378041 is about 42572.0335549055. The cubic root of 1812378041 is about 1219.2223928082. Note that the first 3 decimals are identical.

The spelling of 1812378041 in words is "one billion, eight hundred twelve million, three hundred seventy-eight thousand, forty-one".