12013649 has 4 divisors (see below), whose sum is σ = 12048036. Its totient is φ = 11979264.

The previous prime is 12013637. The next prime is 12013663. The reversal of 12013649 is 94631021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94631021 = 1433 ⋅66037.

It can be written as a sum of positive squares in 2 ways, for example, as 6723649 + 5290000 = 2593^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 12013649 - 2¹² = 12009553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12013699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16664 + ... + 17369.

It is an arithmetic number, because the mean of its divisors is an integer number (3012009).

Almost surely, 2^12013649 is an apocalyptic number.

It is an amenable number.

12013649 is a deficient number, since it is larger than the sum of its proper divisors (34387).

12013649 is an equidigital number, since it uses as much as digits as its factorization.

12013649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34386.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 12013649 is about 3466.0711187164. The cubic root of 12013649 is about 229.0296167590.

The spelling of 12013649 in words is "twelve million, thirteen thousand, six hundred forty-nine".