2538821 has 2 divisors, whose sum is σ = 2538822. Its totient is φ = 2538820.

The previous prime is 2538817. The next prime is 2538827. The reversal of 2538821 is 1288352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2208196 + 330625 = 1486^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 2538821 - 2² = 2538817 is a prime.

It is a super-2 number, since 2×2538821² = 12891224140082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2538827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269410 + 1269411.

It is an arithmetic number, because the mean of its divisors is an integer number (1269411).

2^2538821 is an apocalyptic number.

It is an amenable number.

2538821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2538821 is an equidigital number, since it uses as much as digits as its factorization.

2538821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 2538821 is about 1593.3678169211. The cubic root of 2538821 is about 136.4197849716.

The spelling of 2538821 in words is "two million, five hundred thirty-eight thousand, eight hundred twenty-one".