12649645 has 4 divisors (see below), whose sum is σ = 15179580. Its totient is φ = 10119712.

The previous prime is 12649639. The next prime is 12649699. The reversal of 12649645 is 54694621.

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 6749604 + 5900041 = 2598^2 + 2429^2 .

It is a cyclic number.

It is not a de Polignac number, because 12649645 - 2⁵ = 12649613 is a prime.

It is a super-3 number, since 3×12649645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264960 + ... + 1264969.

It is an arithmetic number, because the mean of its divisors is an integer number (3794895).

Almost surely, 2^12649645 is an apocalyptic number.

It is an amenable number.

12649645 is a deficient number, since it is larger than the sum of its proper divisors (2529935).

12649645 is an equidigital number, since it uses as much as digits as its factorization.

12649645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529934.

The product of its digits is 51840, while the sum is 37.

The square root of 12649645 is about 3556.6339423674. The cubic root of 12649645 is about 233.0018910983.

The spelling of 12649645 in words is "twelve million, six hundred forty-nine thousand, six hundred forty-five".