2604821 has 2 divisors, whose sum is σ = 2604822. Its totient is φ = 2604820.

The previous prime is 2604803. The next prime is 2604829. The reversal of 2604821 is 1284062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2436721 + 168100 = 1561^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604821 - 2¹⁸ = 2342677 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 (2604829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302410 + 1302411.

It is an arithmetic number, because the mean of its divisors is an integer number (1302411).

2^2604821 is an apocalyptic number.

It is an amenable number.

2604821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2604821 is an equidigital number, since it uses as much as digits as its factorization.

2604821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2604821 is about 1613.9457859544. The cubic root of 2604821 is about 137.5918240646.

Adding to 2604821 its reverse (1284062), we get a palindrome (3888883).

The spelling of 2604821 in words is "two million, six hundred four thousand, eight hundred twenty-one".