1800532645 has 8 divisors (see below), whose sum is σ = 2287735704. Its totient is φ = 1355695104.

The previous prime is 1800532639. The next prime is 1800532649. The reversal of 1800532645 is 5462350081.

It can be written as a sum of positive squares in 4 ways, for example, as 47100769 + 1753431876 = 6863^2 + 41874^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1800532645 - 2⁹ = 1800532133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1800532645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800532649) 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 7 ways as a sum of consecutive naturals, for example, 10591284 + ... + 10591453.

It is an arithmetic number, because the mean of its divisors is an integer number (285966963).

Almost surely, 2^1800532645 is an apocalyptic number.

It is an amenable number.

1800532645 is a deficient number, since it is larger than the sum of its proper divisors (487203059).

1800532645 is a wasteful number, since it uses less digits than its factorization.

1800532645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21182759.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1800532645 is about 42432.6836884023. The cubic root of 1800532645 is about 1216.5603744844.

The spelling of 1800532645 in words is "one billion, eight hundred million, five hundred thirty-two thousand, six hundred forty-five".