1808345845 has 16 divisors (see below), whose sum is σ = 2298822768. Its totient is φ = 1360890880.

The previous prime is 1808345839. The next prime is 1808345857. The reversal of 1808345845 is 5485438081.

It can be written as a sum of positive squares in 8 ways, for example, as 399920004 + 1408425841 = 19998^2 + 37529^2 .

It is not a de Polignac number, because 1808345845 - 2²⁵ = 1774791413 is a prime.

It is a super-2 number, since 2×1808345845² = 6540229390257528050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1808345795 and 1808345804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218727 + ... + 226843.

It is an arithmetic number, because the mean of its divisors is an integer number (143676423).

Almost surely, 2^1808345845 is an apocalyptic number.

It is an amenable number.

1808345845 is a deficient number, since it is larger than the sum of its proper divisors (490476923).

1808345845 is a wasteful number, since it uses less digits than its factorization.

1808345845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10760.

The product of its (nonzero) digits is 614400, while the sum is 46.

The square root of 1808345845 is about 42524.6498515861. The cubic root of 1808345845 is about 1218.3175422224.

The spelling of 1808345845 in words is "one billion, eight hundred eight million, three hundred forty-five thousand, eight hundred forty-five".