249743 has 4 divisors (see below), whose sum is σ = 268968. Its totient is φ = 230520.

The previous prime is 249737. The next prime is 249749. The reversal of 249743 is 347942.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (249737) and next prime (249749).

It is a cyclic number.

It is not a de Polignac number, because 249743 - 2⁴ = 249727 is a prime.

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 (249749) 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, 9593 + ... + 9618.

It is an arithmetic number, because the mean of its divisors is an integer number (67242).

2²⁴⁹⁷⁴³ is an apocalyptic number.

249743 is a deficient number, since it is larger than the sum of its proper divisors (19225).

249743 is a wasteful number, since it uses less digits than its factorization.

249743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19224.

The product of its digits is 6048, while the sum is 29.

The square root of 249743 is about 499.7429339170. The cubic root of 249743 is about 62.9744584462.

The spelling of 249743 in words is "two hundred forty-nine thousand, seven hundred forty-three".