249843 has 16 divisors (see below), whose sum is σ = 372096. Its totient is φ = 147840.

The previous prime is 249833. The next prime is 249853. The reversal of 249843 is 348942.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (249833) and next prime (249853).

It is not a de Polignac number, because 249843 - 2⁴ = 249827 is a prime.

249843 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 249843.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249843.

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 15 ways as a sum of consecutive naturals, for example, 2155 + ... + 2267.

It is an arithmetic number, because the mean of its divisors is an integer number (23256).

2²⁴⁹⁸⁴³ is an apocalyptic number.

249843 is a deficient number, since it is larger than the sum of its proper divisors (122253).

249843 is a wasteful number, since it uses less digits than its factorization.

249843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194.

The product of its digits is 6912, while the sum is 30.

The square root of 249843 is about 499.8429753433. The cubic root of 249843 is about 62.9828625596.

Subtracting 249843 from its reverse (348942), we obtain a palindrome (99099).

The spelling of 249843 in words is "two hundred forty-nine thousand, eight hundred forty-three".