2444821 has 4 divisors (see below), whose sum is σ = 2588652. Its totient is φ = 2300992.

The previous prime is 2444809. The next prime is 2444833. The reversal of 2444821 is 1284442.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2444809) and next prime (2444833).

It can be written as a sum of positive squares in 2 ways, for example, as 1782225 + 662596 = 1335^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2444821 - 2¹⁹ = 1920533 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 (2444801) 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, 71890 + ... + 71923.

It is an arithmetic number, because the mean of its divisors is an integer number (647163).

2^2444821 is an apocalyptic number.

It is an amenable number.

2444821 is a deficient number, since it is larger than the sum of its proper divisors (143831).

2444821 is a wasteful number, since it uses less digits than its factorization.

2444821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143830.

The product of its digits is 2048, while the sum is 25.

The square root of 2444821 is about 1563.5923381751. The cubic root of 2444821 is about 134.7149173840.

The spelling of 2444821 in words is "two million, four hundred forty-four thousand, eight hundred twenty-one".