2387821 has 2 divisors, whose sum is σ = 2387822. Its totient is φ = 2387820.

The previous prime is 2387807. The next prime is 2387839. The reversal of 2387821 is 1287832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 396900 = 1411^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 2387821 - 2²¹ = 290669 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 (2387851) 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, 1193910 + 1193911.

It is an arithmetic number, because the mean of its divisors is an integer number (1193911).

2^2387821 is an apocalyptic number.

It is an amenable number.

2387821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2387821 is an equidigital number, since it uses as much as digits as its factorization.

2387821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 2387821 is about 1545.2575837057. The cubic root of 2387821 is about 133.6597329615.

The spelling of 2387821 in words is "two million, three hundred eighty-seven thousand, eight hundred twenty-one".