12009808 has 10 divisors (see below), whose sum is σ = 23269034. Its totient is φ = 6004896.

The previous prime is 12009791. The next prime is 12009821. The reversal of 12009808 is 80890021.

It can be written as a sum of positive squares in only one way, i.e., 11888704 + 121104 = 3448^2 + 348^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 375291 + ... + 375322.

Almost surely, 2^12009808 is an apocalyptic number.

It is an amenable number.

12009808 is a deficient number, since it is larger than the sum of its proper divisors (11259226).

12009808 is an equidigital number, since it uses as much as digits as its factorization.

12009808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750621 (or 750615 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 12009808 is about 3465.5169888488. The cubic root of 12009808 is about 229.0052057320.

Adding to 12009808 its reverse (80890021), we get a palindrome (92899829).

The spelling of 12009808 in words is "twelve million, nine thousand, eight hundred eight".