2443649 has 4 divisors (see below), whose sum is σ = 2631636. Its totient is φ = 2255664.

The previous prime is 2443643. The next prime is 2443657. The reversal of 2443649 is 9463442.

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 1575025 + 868624 = 1255^2 + 932^2 .

It is a cyclic number.

It is not a de Polignac number, because 2443649 - 2¹² = 2439553 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 (2443643) 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, 93974 + ... + 93999.

It is an arithmetic number, because the mean of its divisors is an integer number (657909).

2^2443649 is an apocalyptic number.

It is an amenable number.

2443649 is a deficient number, since it is larger than the sum of its proper divisors (187987).

2443649 is a wasteful number, since it uses less digits than its factorization.

2443649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187986.

The product of its digits is 20736, while the sum is 32.

The square root of 2443649 is about 1563.2175152550. The cubic root of 2443649 is about 134.6933873662.

The spelling of 2443649 in words is "two million, four hundred forty-three thousand, six hundred forty-nine".