1809312080 has 40 divisors (see below), whose sum is σ = 4208883144. Its totient is φ = 723340800.

The previous prime is 1809312041. The next prime is 1809312097. The reversal of 1809312080 is 802139081.

It can be written as a sum of positive squares in 4 ways, for example, as 341056 + 1808971024 = 584^2 + 42532^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1809312080² = 6547220405667852800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182450 + ... + 192110.

Almost surely, 2^1809312080 is an apocalyptic number.

1809312080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1809312080 is an abundant number, since it is smaller than the sum of its proper divisors (2399571064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1809312080 is a wasteful number, since it uses less digits than its factorization.

1809312080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12015 (or 12009 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1809312080 is about 42536.0092157222. The cubic root of 1809312080 is about 1218.5344939838.

The spelling of 1809312080 in words is "one billion, eight hundred nine million, three hundred twelve thousand, eighty".