2789821 has 2 divisors, whose sum is σ = 2789822. Its totient is φ = 2789820.

The previous prime is 2789791. The next prime is 2789849. The reversal of 2789821 is 1289872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 1125721 = 1290^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2789821 - 2¹³ = 2781629 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 (2789861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394910 + 1394911.

It is an arithmetic number, because the mean of its divisors is an integer number (1394911).

2^2789821 is an apocalyptic number.

It is an amenable number.

2789821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2789821 is an equidigital number, since it uses as much as digits as its factorization.

2789821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 2789821 is about 1670.2757257411. The cubic root of 2789821 is about 140.7749709352.

The spelling of 2789821 in words is "two million, seven hundred eighty-nine thousand, eight hundred twenty-one".