2809243 has 8 divisors (see below), whose sum is σ = 2976768. Its totient is φ = 2645544.

The previous prime is 2809241. The next prime is 2809249. The reversal of 2809243 is 3429082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2809243 - 2¹ = 2809241 is a prime.

It is a Duffinian number.

2809243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2809241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 2452.

It is an arithmetic number, because the mean of its divisors is an integer number (372096).

2^2809243 is an apocalyptic number.

2809243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2809243 is a deficient number, since it is larger than the sum of its proper divisors (167525).

2809243 is a wasteful number, since it uses less digits than its factorization.

2809243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 2809243 is about 1676.0796520452. The cubic root of 2809243 is about 141.1008952081.

The spelling of 2809243 in words is "two million, eight hundred nine thousand, two hundred forty-three".