549839 has 2 divisors, whose sum is σ = 549840. Its totient is φ = 549838.

The previous prime is 549833. The next prime is 549863. The reversal of 549839 is 938945.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 549839 - 2¹⁶ = 484303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274919 + 274920.

It is an arithmetic number, because the mean of its divisors is an integer number (274920).

2⁵⁴⁹⁸³⁹ is an apocalyptic number.

549839 is a deficient number, since it is larger than the sum of its proper divisors (1).

549839 is an equidigital number, since it uses as much as digits as its factorization.

549839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 549839 is about 741.5112945869. The cubic root of 549839 is about 81.9241316905.

The spelling of 549839 in words is "five hundred forty-nine thousand, eight hundred thirty-nine".