2803985809 has 4 divisors (see below), whose sum is σ = 2814647616. Its totient is φ = 2793324004.

The previous prime is 2803985803. The next prime is 2803985827. The reversal of 2803985809 is 9085893082.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2803985809 - 2³ = 2803985801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2803985801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5330509 + ... + 5331034.

It is an arithmetic number, because the mean of its divisors is an integer number (703661904).

Almost surely, 2^2803985809 is an apocalyptic number.

It is an amenable number.

2803985809 is a deficient number, since it is larger than the sum of its proper divisors (10661807).

2803985809 is a wasteful number, since it uses less digits than its factorization.

2803985809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661806.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 2803985809 is about 52952.6751826572. The cubic root of 2803985809 is about 1410.1282194819.

The spelling of 2803985809 in words is "two billion, eight hundred three million, nine hundred eighty-five thousand, eight hundred nine".