2798921 has 2 divisors, whose sum is σ = 2798922. Its totient is φ = 2798920.

The previous prime is 2798903. The next prime is 2798923. The reversal of 2798921 is 1298972.

2798921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2758921 + 40000 = 1661^2 + 200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2798921 is a prime.

It is a Sophie Germain prime.

Together with 2798923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2798923) 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, 1399460 + 1399461.

It is an arithmetic number, because the mean of its divisors is an integer number (1399461).

2^2798921 is an apocalyptic number.

It is an amenable number.

2798921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2798921 is an equidigital number, since it uses as much as digits as its factorization.

2798921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 2798921 is about 1672.9976090838. The cubic root of 2798921 is about 140.9278674692.

The spelling of 2798921 in words is "two million, seven hundred ninety-eight thousand, nine hundred twenty-one".