2805987 has 8 divisors (see below), whose sum is σ = 3776080. Its totient is φ = 1853280.

The previous prime is 2805973. The next prime is 2805989. The reversal of 2805987 is 7895082.

2805987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2805987 - 2⁶ = 2805923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2805989) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3964 + ... + 4617.

It is an arithmetic number, because the mean of its divisors is an integer number (472010).

2^2805987 is an apocalyptic number.

2805987 is a deficient number, since it is larger than the sum of its proper divisors (970093).

2805987 is a wasteful number, since it uses less digits than its factorization.

2805987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8693.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 2805987 is about 1675.1080562161. The cubic root of 2805987 is about 141.0463606918.

The spelling of 2805987 in words is "two million, eight hundred five thousand, nine hundred eighty-seven".