243920975 has 12 divisors (see below), whose sum is σ = 303031944. Its totient is φ = 194769120.

The previous prime is 243920939. The next prime is 243920977. The reversal of 243920975 is 579029342.

It is a de Polignac number, because none of the positive numbers 2^k-243920975 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243920977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4757 + ... + 22593.

It is an arithmetic number, because the mean of its divisors is an integer number (25252662).

Almost surely, 2^243920975 is an apocalyptic number.

243920975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

243920975 is a deficient number, since it is larger than the sum of its proper divisors (59110969).

243920975 is a wasteful number, since it uses less digits than its factorization.

243920975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18394 (or 18389 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 243920975 is about 15617.9696183595. The cubic root of 243920975 is about 624.8125090944.

The spelling of 243920975 in words is "two hundred forty-three million, nine hundred twenty thousand, nine hundred seventy-five".