12489665 has 4 divisors (see below), whose sum is σ = 14987604. Its totient is φ = 9991728.

The previous prime is 12489661. The next prime is 12489703. The reversal of 12489665 is 56698421.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4910656 + 7579009 = 2216^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 12489665 - 2² = 12489661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12489661) 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, 1248962 + ... + 1248971.

It is an arithmetic number, because the mean of its divisors is an integer number (3746901).

Almost surely, 2^12489665 is an apocalyptic number.

It is an amenable number.

12489665 is a deficient number, since it is larger than the sum of its proper divisors (2497939).

12489665 is an equidigital number, since it uses as much as digits as its factorization.

12489665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497938.

The product of its digits is 103680, while the sum is 41.

The square root of 12489665 is about 3534.0720139805. The cubic root of 12489665 is about 232.0154629507.

The spelling of 12489665 in words is "twelve million, four hundred eighty-nine thousand, six hundred sixty-five".