12045817 has 20 divisors (see below), whose sum is σ = 14621220. Its totient is φ = 9911328.

The previous prime is 12045811. The next prime is 12045833. The reversal of 12045817 is 71854021.

It can be written as a sum of positive squares in 2 ways, for example, as 8934121 + 3111696 = 2989^2 + 1764^2 .

It is not a de Polignac number, because 12045817 - 2⁷ = 12045689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12045811) 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 19 ways as a sum of consecutive naturals, for example, 69543 + ... + 69715.

It is an arithmetic number, because the mean of its divisors is an integer number (731061).

Almost surely, 2^12045817 is an apocalyptic number.

It is an amenable number.

12045817 is a deficient number, since it is larger than the sum of its proper divisors (2575403).

12045817 is an frugal number, since it uses more digits than its factorization.

12045817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 12045817 is about 3470.7084291251. The cubic root of 12045817 is about 229.2338527562.

Adding to 12045817 its reverse (71854021), we get a palindrome (83899838).

It can be divided in two parts, 1204 and 5817, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 12045817 in words is "twelve million, forty-five thousand, eight hundred seventeen".