243780249 has 16 divisors (see below), whose sum is σ = 335957504. Its totient is φ = 157075200.

The previous prime is 243780247. The next prime is 243780263. The reversal of 243780249 is 942087342.

It is not a de Polignac number, because 243780249 - 2¹ = 243780247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243780247) 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, 111729 + ... + 113889.

It is an arithmetic number, because the mean of its divisors is an integer number (20997344).

Almost surely, 2^243780249 is an apocalyptic number.

It is an amenable number.

243780249 is a deficient number, since it is larger than the sum of its proper divisors (92177255).

243780249 is a wasteful number, since it uses less digits than its factorization.

243780249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 243780249 is about 15613.4637092479. The cubic root of 243780249 is about 624.6923277119.

The spelling of 243780249 in words is "two hundred forty-three million, seven hundred eighty thousand, two hundred forty-nine".