249799 has 4 divisors (see below), whose sum is σ = 272520. Its totient is φ = 227080.

The previous prime is 249797. The next prime is 249811. The reversal of 249799 is 997942.

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 249799 - 2¹ = 249797 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249797) 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 in 3 ways as a sum of consecutive naturals, for example, 11344 + ... + 11365.

It is an arithmetic number, because the mean of its divisors is an integer number (68130).

2²⁴⁹⁷⁹⁹ is an apocalyptic number.

249799 is a deficient number, since it is larger than the sum of its proper divisors (22721).

249799 is a wasteful number, since it uses less digits than its factorization.

249799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22720.

The product of its digits is 40824, while the sum is 40.

The square root of 249799 is about 499.7989595828. The cubic root of 249799 is about 62.9791650260.

The spelling of 249799 in words is "two hundred forty-nine thousand, seven hundred ninety-nine".