2809993 has 8 divisors (see below), whose sum is σ = 2892960. Its totient is φ = 2728320.

The previous prime is 2809987. The next prime is 2810009. The reversal of 2809993 is 3999082.

It is a happy number.

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 2809993 - 2¹³ = 2801801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2809903) 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, 5478 + ... + 5968.

It is an arithmetic number, because the mean of its divisors is an integer number (361620).

2^2809993 is an apocalyptic number.

It is an amenable number.

2809993 is a deficient number, since it is larger than the sum of its proper divisors (82967).

2809993 is an equidigital number, since it uses as much as digits as its factorization.

2809993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 2809993 is about 1676.3033734978. The cubic root of 2809993 is about 141.1134509340.

The spelling of 2809993 in words is "two million, eight hundred nine thousand, nine hundred ninety-three".