12704665 has 4 divisors (see below), whose sum is σ = 15245604. Its totient is φ = 10163728.

The previous prime is 12704663. The next prime is 12704693. The reversal of 12704665 is 56640721.

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 7722841 + 4981824 = 2779^2 + 2232^2 .

It is a cyclic number.

It is not a de Polignac number, because 12704665 - 2¹ = 12704663 is a prime.

It is a super-2 number, since 2×12704665² = 322817025524450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12704663) 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, 1270462 + ... + 1270471.

It is an arithmetic number, because the mean of its divisors is an integer number (3811401).

Almost surely, 2^12704665 is an apocalyptic number.

It is an amenable number.

12704665 is a deficient number, since it is larger than the sum of its proper divisors (2540939).

12704665 is an equidigital number, since it uses as much as digits as its factorization.

12704665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540938.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 12704665 is about 3564.3603914307. The cubic root of 12704665 is about 233.3392186724.

The spelling of 12704665 in words is "twelve million, seven hundred four thousand, six hundred sixty-five".