2544821 has 8 divisors (see below), whose sum is σ = 2655744. Its totient is φ = 2435760.

The previous prime is 2544811. The next prime is 2544833. The reversal of 2544821 is 1284452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2544821 - 2⁶ = 2544757 is a prime.

It is a super-2 number, since 2×2544821² = 12952227844082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2544811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2795 + ... + 3591.

It is an arithmetic number, because the mean of its divisors is an integer number (331968).

2^2544821 is an apocalyptic number.

It is an amenable number.

2544821 is a deficient number, since it is larger than the sum of its proper divisors (110923).

2544821 is a wasteful number, since it uses less digits than its factorization.

2544821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 2560, while the sum is 26.

The square root of 2544821 is about 1595.2495102648. The cubic root of 2544821 is about 136.5271674604.

The spelling of 2544821 in words is "two million, five hundred forty-four thousand, eight hundred twenty-one".