249839 has 4 divisors (see below), whose sum is σ = 251160. Its totient is φ = 248520.

The previous prime is 249833. The next prime is 249853. The reversal of 249839 is 938942.

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 249839 - 2⁸ = 249583 is a prime.

It is a d-powerful number, because it can be written as 2 + 4⁸ + 8³ + 9² + 3¹¹ + 9⁴ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249799 and 249808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317 + ... + 774.

It is an arithmetic number, because the mean of its divisors is an integer number (62790).

2²⁴⁹⁸³⁹ is an apocalyptic number.

249839 is a deficient number, since it is larger than the sum of its proper divisors (1321).

249839 is a wasteful number, since it uses less digits than its factorization.

249839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320.

The product of its digits is 15552, while the sum is 35.

The square root of 249839 is about 499.8389740707. The cubic root of 249839 is about 62.9825264381.

The spelling of 249839 in words is "two hundred forty-nine thousand, eight hundred thirty-nine".