2808493 has 4 divisors (see below), whose sum is σ = 2812768. Its totient is φ = 2804220.

The previous prime is 2808479. The next prime is 2808497. The reversal of 2808493 is 3948082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3948082 = 2 ⋅1974041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2808493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2808497) 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 in 3 ways as a sum of consecutive naturals, for example, 921 + ... + 2542.

It is an arithmetic number, because the mean of its divisors is an integer number (703192).

2^2808493 is an apocalyptic number.

It is an amenable number.

2808493 is a deficient number, since it is larger than the sum of its proper divisors (4275).

2808493 is an equidigital number, since it uses as much as digits as its factorization.

2808493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4274.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 2808493 is about 1675.8559007266. The cubic root of 2808493 is about 141.0883372473.

The spelling of 2808493 in words is "two million, eight hundred eight thousand, four hundred ninety-three".