1808831812 has 12 divisors (see below), whose sum is σ = 3167106796. Its totient is φ = 903944160.

The previous prime is 1808831789. The next prime is 1808831813. The reversal of 1808831812 is 2181388081.

It can be written as a sum of positive squares in 2 ways, for example, as 1347183616 + 461648196 = 36704^2 + 21486^2 .

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 not an unprimeable number, because it can be changed into a prime (1808831813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109239 + ... + 124702.

Almost surely, 2^1808831812 is an apocalyptic number.

It is an amenable number.

1808831812 is a deficient number, since it is larger than the sum of its proper divisors (1358274984).

1808831812 is a wasteful number, since it uses less digits than its factorization.

1808831812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235878 (or 235876 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 1808831812 is about 42530.3634125080. The cubic root of 1808831812 is about 1218.4266675675.

The spelling of 1808831812 in words is "one billion, eight hundred eight million, eight hundred thirty-one thousand, eight hundred twelve".