12443661 has 6 divisors (see below), whose sum is σ = 17974190. Its totient is φ = 8295768.

The previous prime is 12443657. The next prime is 12443681. The reversal of 12443661 is 16634421.

12443661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 1454436 = 3315^2 + 1206^2 .

It is not a de Polignac number, because 12443661 - 2² = 12443657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12443611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 691306 + ... + 691323.

Almost surely, 2^12443661 is an apocalyptic number.

It is an amenable number.

12443661 is a deficient number, since it is larger than the sum of its proper divisors (5530529).

12443661 is a wasteful number, since it uses less digits than its factorization.

12443661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382635 (or 1382632 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 12443661 is about 3527.5573701926. The cubic root of 12443661 is about 231.7302465682.

The spelling of 12443661 in words is "twelve million, four hundred forty-three thousand, six hundred sixty-one".