1800381009 has 32 divisors (see below), whose sum is σ = 2834694144. Its totient is φ = 995117760.

The previous prime is 1800381001. The next prime is 1800381041. The reversal of 1800381009 is 9001830081.

It is not a de Polignac number, because 1800381009 - 2³ = 1800381001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1800381001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67632 + ... + 90414.

It is an arithmetic number, because the mean of its divisors is an integer number (88584192).

Almost surely, 2^1800381009 is an apocalyptic number.

It is an amenable number.

1800381009 is a deficient number, since it is larger than the sum of its proper divisors (1034313135).

1800381009 is a wasteful number, since it uses less digits than its factorization.

1800381009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22917.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1800381009 is about 42430.8968677307. The cubic root of 1800381009 is about 1216.5262217151.

The spelling of 1800381009 in words is "one billion, eight hundred million, three hundred eighty-one thousand, nine".