2904821 has 2 divisors, whose sum is σ = 2904822. Its totient is φ = 2904820.

The previous prime is 2904791. The next prime is 2904827. The reversal of 2904821 is 1284092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2640625 + 264196 = 1625^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2904821 - 2⁶ = 2904757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2904827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1452410 + 1452411.

It is an arithmetic number, because the mean of its divisors is an integer number (1452411).

2^2904821 is an apocalyptic number.

It is an amenable number.

2904821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2904821 is an equidigital number, since it uses as much as digits as its factorization.

2904821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2904821 is about 1704.3535431359. The cubic root of 2904821 is about 142.6832934252.

The spelling of 2904821 in words is "two million, nine hundred four thousand, eight hundred twenty-one".