2809965 has 32 divisors (see below), whose sum is σ = 4749696. Its totient is φ = 1416960.

The previous prime is 2809931. The next prime is 2809973. The reversal of 2809965 is 5699082.

It is a happy number.

2809965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2809965 - 2⁷ = 2809837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33814 + ... + 33896.

It is an arithmetic number, because the mean of its divisors is an integer number (148428).

2^2809965 is an apocalyptic number.

It is an amenable number.

2809965 is a deficient number, since it is larger than the sum of its proper divisors (1939731).

2809965 is a wasteful number, since it uses less digits than its factorization.

2809965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 2809965 is about 1676.2950217668. The cubic root of 2809965 is about 141.1129822271.

The spelling of 2809965 in words is "two million, eight hundred nine thousand, nine hundred sixty-five".