243749 has 4 divisors (see below), whose sum is σ = 265920. Its totient is φ = 221580.

The previous prime is 243709. The next prime is 243769. The reversal of 243749 is 947342.

243749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243749 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 4⁴ + 7² + 3¹¹ + 4⁸ + 9³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243709) 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, 11069 + ... + 11090.

It is an arithmetic number, because the mean of its divisors is an integer number (66480).

2²⁴³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

243749 is a deficient number, since it is larger than the sum of its proper divisors (22171).

243749 is a wasteful number, since it uses less digits than its factorization.

243749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22170.

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

The square root of 243749 is about 493.7094287129. The cubic root of 243749 is about 62.4665634485.

It can be divided in two parts, 24 and 3749, that added together give a palindrome (3773).

The spelling of 243749 in words is "two hundred forty-three thousand, seven hundred forty-nine".