2871989 has 4 divisors (see below), whose sum is σ = 2878656. Its totient is φ = 2865324.

The previous prime is 2871971. The next prime is 2871991. The reversal of 2871989 is 9891782.

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 2871989 - 2²⁰ = 1823413 is a prime.

It is a super-2 number, since 2×2871989² = 16496641632242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2871919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2639 + ... + 3564.

It is an arithmetic number, because the mean of its divisors is an integer number (719664).

2^2871989 is an apocalyptic number.

It is an amenable number.

2871989 is a deficient number, since it is larger than the sum of its proper divisors (6667).

2871989 is an equidigital number, since it uses as much as digits as its factorization.

2871989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666.

The product of its digits is 72576, while the sum is 44.

The square root of 2871989 is about 1694.6943677253. The cubic root of 2871989 is about 142.1436917489.

The spelling of 2871989 in words is "two million, eight hundred seventy-one thousand, nine hundred eighty-nine".