1800345249 has 6 divisors (see below), whose sum is σ = 2600498706. Its totient is φ = 1200230160.

The previous prime is 1800345233. The next prime is 1800345307. The reversal of 1800345249 is 9425430081.

It can be written as a sum of positive squares in only one way, i.e., 1201662225 + 598683024 = 34665^2 + 24468^2 .

It is not a de Polignac number, because 1800345249 - 2⁴ = 1800345233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1800345229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100019172 + ... + 100019189.

It is an arithmetic number, because the mean of its divisors is an integer number (433416451).

Almost surely, 2^1800345249 is an apocalyptic number.

It is an amenable number.

1800345249 is a deficient number, since it is larger than the sum of its proper divisors (800153457).

1800345249 is a wasteful number, since it uses less digits than its factorization.

1800345249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200038367 (or 200038364 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1800345249 is about 42430.4754745926. The cubic root of 1800345249 is about 1216.5181672597.

The spelling of 1800345249 in words is "one billion, eight hundred million, three hundred forty-five thousand, two hundred forty-nine".