2087891 has 16 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 1785888.

The previous prime is 2087879. The next prime is 2087903. The reversal of 2087891 is 1987802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2087879) and next prime (2087903).

It is not a de Polignac number, because 2087891 - 2¹⁴ = 2071507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2087801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19460 + ... + 19566.

It is an arithmetic number, because the mean of its divisors is an integer number (151200).

2^2087891 is an apocalyptic number.

2087891 is a deficient number, since it is larger than the sum of its proper divisors (331309).

2087891 is a wasteful number, since it uses less digits than its factorization.

2087891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 2087891 is about 1444.9536324741. The cubic root of 2087891 is about 127.8113064433.

The spelling of 2087891 in words is "two million, eighty-seven thousand, eight hundred ninety-one".