2809987 has 2 divisors, whose sum is σ = 2809988. Its totient is φ = 2809986.

The previous prime is 2809973. The next prime is 2810009. The reversal of 2809987 is 7899082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2809987 - 2¹⁵ = 2777219 is a prime.

It is not a weakly prime, because it can be changed into another prime (2809087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404993 + 1404994.

It is an arithmetic number, because the mean of its divisors is an integer number (1404994).

2^2809987 is an apocalyptic number.

2809987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809987 is an equidigital number, since it uses as much as digits as its factorization.

2809987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 2809987 is about 1676.3015838446. The cubic root of 2809987 is about 141.1133504971.

The spelling of 2809987 in words is "two million, eight hundred nine thousand, nine hundred eighty-seven".