249439 has 2 divisors, whose sum is σ = 249440. Its totient is φ = 249438.

The previous prime is 249437. The next prime is 249449. The reversal of 249439 is 934942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249439 - 2¹ = 249437 is a prime.

Together with 249437, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2¹⁷ + 4 + 4⁴ + 9 + 3¹⁰ + 9⁵ .

249439 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 249439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249433) 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 as a sum of consecutive naturals, namely, 124719 + 124720.

It is an arithmetic number, because the mean of its divisors is an integer number (124720).

2²⁴⁹⁴³⁹ is an apocalyptic number.

249439 is a deficient number, since it is larger than the sum of its proper divisors (1).

249439 is an equidigital number, since it uses as much as digits as its factorization.

249439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 249439 is about 499.4386849254. The cubic root of 249439 is about 62.9488961569.

The spelling of 249439 in words is "two hundred forty-nine thousand, four hundred thirty-nine".