2809493 has 2 divisors, whose sum is σ = 2809494. Its totient is φ = 2809492.

The previous prime is 2809489. The next prime is 2809507. The reversal of 2809493 is 3949082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2140369 + 669124 = 1463^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 2809493 - 2² = 2809489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2809423) 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, 1404746 + 1404747.

It is an arithmetic number, because the mean of its divisors is an integer number (1404747).

2^2809493 is an apocalyptic number.

It is an amenable number.

2809493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809493 is an equidigital number, since it uses as much as digits as its factorization.

2809493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 2809493 is about 1676.1542291806. The cubic root of 2809493 is about 141.1050806984.

The spelling of 2809493 in words is "two million, eight hundred nine thousand, four hundred ninety-three".