2727821 has 2 divisors, whose sum is σ = 2727822. Its totient is φ = 2727820.

The previous prime is 2727817. The next prime is 2727839. The reversal of 2727821 is 1287272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 972196 = 1325^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2727821 - 2² = 2727817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₁₉₈₅₁₅ and since 2727821 and 198515 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2727841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1363910 + 1363911.

It is an arithmetic number, because the mean of its divisors is an integer number (1363911).

2^2727821 is an apocalyptic number.

It is an amenable number.

2727821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2727821 is an equidigital number, since it uses as much as digits as its factorization.

2727821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 29.

The square root of 2727821 is about 1651.6116371593. The cubic root of 2727821 is about 139.7243043803.

The spelling of 2727821 in words is "two million, seven hundred twenty-seven thousand, eight hundred twenty-one".