12665798 has 4 divisors (see below), whose sum is σ = 18998700. Its totient is φ = 6332898.

The previous prime is 12665791. The next prime is 12665827. The reversal of 12665798 is 89756621.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166448 + ... + 3166451.

It is an arithmetic number, because the mean of its divisors is an integer number (4749675).

Almost surely, 2^12665798 is an apocalyptic number.

12665798 is a deficient number, since it is larger than the sum of its proper divisors (6332902).

12665798 is an equidigital number, since it uses as much as digits as its factorization.

12665798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332901.

The product of its digits is 181440, while the sum is 44.

The square root of 12665798 is about 3558.9040447868. The cubic root of 12665798 is about 233.1010263881.

The spelling of 12665798 in words is "twelve million, six hundred sixty-five thousand, seven hundred ninety-eight".