2086391 has 4 divisors (see below), whose sum is σ = 2091000. Its totient is φ = 2081784.

The previous prime is 2086363. The next prime is 2086397. The reversal of 2086391 is 1936802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2086391 - 2¹⁰ = 2085367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2086397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541 + ... + 2558.

It is an arithmetic number, because the mean of its divisors is an integer number (522750).

2^2086391 is an apocalyptic number.

2086391 is a deficient number, since it is larger than the sum of its proper divisors (4609).

2086391 is an equidigital number, since it uses as much as digits as its factorization.

2086391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2086391 is about 1444.4344914187. The cubic root of 2086391 is about 127.7806913569.

The spelling of 2086391 in words is "two million, eighty-six thousand, three hundred ninety-one".