1812925729 has 4 divisors (see below), whose sum is σ = 1813672084. Its totient is φ = 1812179376.

The previous prime is 1812925693. The next prime is 1812925771. The reversal of 1812925729 is 9275292181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1301261329 + 511664400 = 36073^2 + 22620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812925729 - 2¹³ = 1812917537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812925789) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 369522 + ... + 374395.

It is an arithmetic number, because the mean of its divisors is an integer number (453418021).

Almost surely, 2^1812925729 is an apocalyptic number.

It is an amenable number.

1812925729 is a deficient number, since it is larger than the sum of its proper divisors (746355).

1812925729 is an equidigital number, since it uses as much as digits as its factorization.

1812925729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746354.

The product of its digits is 181440, while the sum is 46.

The square root of 1812925729 is about 42578.4655547849. The cubic root of 1812925729 is about 1219.3451939396.

The spelling of 1812925729 in words is "one billion, eight hundred twelve million, nine hundred twenty-five thousand, seven hundred twenty-nine".