12291808 has 24 divisors (see below), whose sum is σ = 24765048. Its totient is φ = 6002304.

The previous prime is 12291793. The next prime is 12291809. The reversal of 12291808 is 80819221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12291808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3091 + ... + 5842.

It is an arithmetic number, because the mean of its divisors is an integer number (1031877).

Almost surely, 2^12291808 is an apocalyptic number.

It is an amenable number.

12291808 is an abundant number, since it is smaller than the sum of its proper divisors (12473240).

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

12291808 is an equidigital number, since it uses as much as digits as its factorization.

12291808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8986 (or 8978 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 12291808 is about 3505.9674841618. The cubic root of 12291808 is about 230.7837659677.

The spelling of 12291808 in words is "twelve million, two hundred ninety-one thousand, eight hundred eight".