243826645 has 12 divisors (see below), whose sum is σ = 297656460. Its totient is φ = 191741504.

The previous prime is 243826619. The next prime is 243826651. The reversal of 243826645 is 546628342.

It can be written as a sum of positive squares in 2 ways, for example, as 142038724 + 101787921 = 11918^2 + 10089^2 .

It is not a de Polignac number, because 243826645 - 2¹³ = 243818453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243826598 and 243826607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10401 + ... + 24409.

It is an arithmetic number, because the mean of its divisors is an integer number (24804705).

Almost surely, 2^243826645 is an apocalyptic number.

It is an amenable number.

243826645 is a deficient number, since it is larger than the sum of its proper divisors (53829815).

243826645 is an equidigital number, since it uses as much as digits as its factorization.

243826645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14132 (or 14073 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 243826645 is about 15614.9494075389. The cubic root of 243826645 is about 624.7319554598.

The spelling of 243826645 in words is "two hundred forty-three million, eight hundred twenty-six thousand, six hundred forty-five".