12809242 has 16 divisors (see below), whose sum is σ = 19974600. Its totient is φ = 6153280.

The previous prime is 12809221. The next prime is 12809281. The reversal of 12809242 is 24290821.

It is a Cunningham number, because it is equal to 3579²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 6713281 + 6095961 = 2591^2 + 2469^2 .

It is a super-2 number, since 2×12809242² = 328153361229128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12809242.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15192 + ... + 16012.

Almost surely, 2^12809242 is an apocalyptic number.

12809242 is a deficient number, since it is larger than the sum of its proper divisors (7165358).

12809242 is a wasteful number, since it uses less digits than its factorization.

12809242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 12809242 is about 3579.0001397038. Note that the first 3 decimals coincide. The cubic root of 12809242 is about 233.9777050373.

The spelling of 12809242 in words is "twelve million, eight hundred nine thousand, two hundred forty-two".