2091839 has 2 divisors, whose sum is σ = 2091840. Its totient is φ = 2091838.

The previous prime is 2091809. The next prime is 2091847. The reversal of 2091839 is 9381902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2091839 - 2¹⁶ = 2026303 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091809) 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 as a sum of consecutive naturals, namely, 1045919 + 1045920.

It is an arithmetic number, because the mean of its divisors is an integer number (1045920).

2^2091839 is an apocalyptic number.

2091839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091839 is an equidigital number, since it uses as much as digits as its factorization.

2091839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2091839 is about 1446.3191210794. The cubic root of 2091839 is about 127.8918153271.

It can be divided in two parts, 209 and 1839, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 2091839 in words is "two million, ninety-one thousand, eight hundred thirty-nine".