1808185108 has 12 divisors (see below), whose sum is σ = 3164622580. Its totient is φ = 904007232.

The previous prime is 1808185087. The next prime is 1808185109. The reversal of 1808185108 is 8015818081.

It can be written as a sum of positive squares in 2 ways, for example, as 1675428624 + 132756484 = 40932^2 + 11522^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808185109) 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 3 ways as a sum of consecutive naturals, for example, 66910 + ... + 89962.

Almost surely, 2^1808185108 is an apocalyptic number.

It is an amenable number.

1808185108 is a deficient number, since it is larger than the sum of its proper divisors (1356437472).

1808185108 is a wasteful number, since it uses less digits than its factorization.

1808185108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42666 (or 42664 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 40.

The square root of 1808185108 is about 42522.7598822090. The cubic root of 1808185108 is about 1218.2814439451.

The spelling of 1808185108 in words is "one billion, eight hundred eight million, one hundred eighty-five thousand, one hundred eight".