243945428 has 12 divisors (see below), whose sum is σ = 428567412. Its totient is φ = 121497600.

The previous prime is 243945371. The next prime is 243945433. The reversal of 243945428 is 824549342.

It can be written as a sum of positive squares in 2 ways, for example, as 201980944 + 41964484 = 14212^2 + 6478^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117623 + ... + 119678.

It is an arithmetic number, because the mean of its divisors is an integer number (35713951).

Almost surely, 2^243945428 is an apocalyptic number.

It is an amenable number.

243945428 is a deficient number, since it is larger than the sum of its proper divisors (184621984).

243945428 is a wasteful number, since it uses less digits than its factorization.

243945428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237562 (or 237560 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The square root of 243945428 is about 15618.7524469786. The cubic root of 243945428 is about 624.8333874817.

The spelling of 243945428 in words is "two hundred forty-three million, nine hundred forty-five thousand, four hundred twenty-eight".