243456645 has 8 divisors (see below), whose sum is σ = 389530656. Its totient is φ = 129843536.

The previous prime is 243456601. The next prime is 243456649. The reversal of 243456645 is 546654342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243456645 - 2¹⁹ = 242932357 is a prime.

It is a super-2 number, since 2×243456645² = 118542275989312050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243456649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8115207 + ... + 8115236.

It is an arithmetic number, because the mean of its divisors is an integer number (48691332).

Almost surely, 2^243456645 is an apocalyptic number.

It is an amenable number.

243456645 is a deficient number, since it is larger than the sum of its proper divisors (146074011).

243456645 is a wasteful number, since it uses less digits than its factorization.

243456645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16230451.

The product of its digits is 345600, while the sum is 39.

The square root of 243456645 is about 15603.0972886796. The cubic root of 243456645 is about 624.4157911569.

The spelling of 243456645 in words is "two hundred forty-three million, four hundred fifty-six thousand, six hundred forty-five".