12443649 has 4 divisors (see below), whose sum is σ = 16591536. Its totient is φ = 8295764.

The previous prime is 12443647. The next prime is 12443657. The reversal of 12443649 is 94634421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12443649 - 2¹ = 12443647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12443647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073939 + ... + 2073944.

It is an arithmetic number, because the mean of its divisors is an integer number (4147884).

It is a Proth number, since it is equal to 1519 ⋅ 2¹³ + 1 and 1519 < 2¹³.

Almost surely, 2^12443649 is an apocalyptic number.

It is an amenable number.

12443649 is a deficient number, since it is larger than the sum of its proper divisors (4147887).

12443649 is an equidigital number, since it uses as much as digits as its factorization.

12443649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4147886.

The product of its digits is 20736, while the sum is 33.

The square root of 12443649 is about 3527.5556692985. Note that the first 3 decimals coincide. The cubic root of 12443649 is about 231.7301720787.

The spelling of 12443649 in words is "twelve million, four hundred forty-three thousand, six hundred forty-nine".