1812043729 has 2 divisors, whose sum is σ = 1812043730. Its totient is φ = 1812043728.

The previous prime is 1812043721. The next prime is 1812043817. The reversal of 1812043729 is 9273402181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1531548225 + 280495504 = 39135^2 + 16748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812043729 - 2³ = 1812043721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1812043721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906021864 + 906021865.

It is an arithmetic number, because the mean of its divisors is an integer number (906021865).

Almost surely, 2^1812043729 is an apocalyptic number.

It is an amenable number.

1812043729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812043729 is an equidigital number, since it uses as much as digits as its factorization.

1812043729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1812043729 is about 42568.1069463983. The cubic root of 1812043729 is about 1219.1474221100.

The spelling of 1812043729 in words is "one billion, eight hundred twelve million, forty-three thousand, seven hundred twenty-nine".