2499821 has 2 divisors, whose sum is σ = 2499822. Its totient is φ = 2499820.

The previous prime is 2499803. The next prime is 2499853. The reversal of 2499821 is 1289942.

2499821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2418025 + 81796 = 1555^2 + 286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2499821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2499881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249910 + 1249911.

It is an arithmetic number, because the mean of its divisors is an integer number (1249911).

2^2499821 is an apocalyptic number.

It is an amenable number.

2499821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2499821 is an equidigital number, since it uses as much as digits as its factorization.

2499821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 2499821 is about 1581.0822243008. The cubic root of 2499821 is about 135.7176415474.

The spelling of 2499821 in words is "two million, four hundred ninety-nine thousand, eight hundred twenty-one".