1800298009 has 4 divisors (see below), whose sum is σ = 1800385204. Its totient is φ = 1800210816.

The previous prime is 1800298007. The next prime is 1800298039. The reversal of 1800298009 is 9008920081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1587225600 + 213072409 = 39840^2 + 14597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800298009 - 2¹ = 1800298007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1800298001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6769 + ... + 60385.

It is an arithmetic number, because the mean of its divisors is an integer number (450096301).

Almost surely, 2^1800298009 is an apocalyptic number.

It is an amenable number.

1800298009 is a deficient number, since it is larger than the sum of its proper divisors (87195).

1800298009 is an equidigital number, since it uses as much as digits as its factorization.

1800298009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87194.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1800298009 is about 42429.9187955857. The cubic root of 1800298009 is about 1216.5075269263.

The spelling of 1800298009 in words is "one billion, eight hundred million, two hundred ninety-eight thousand, nine".