2805889 has 4 divisors (see below), whose sum is σ = 2827440. Its totient is φ = 2784340.

The previous prime is 2805851. The next prime is 2805899. The reversal of 2805889 is 9885082.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9885082 = 2 ⋅4942541.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2805889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2805809) 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, 10579 + ... + 10840.

It is an arithmetic number, because the mean of its divisors is an integer number (706860).

2^2805889 is an apocalyptic number.

It is an amenable number.

2805889 is a deficient number, since it is larger than the sum of its proper divisors (21551).

2805889 is a wasteful number, since it uses less digits than its factorization.

2805889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21550.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 2805889 is about 1675.0788041164. The cubic root of 2805889 is about 141.0447186428.

The spelling of 2805889 in words is "two million, eight hundred five thousand, eight hundred eighty-nine".