243023845 has 12 divisors (see below), whose sum is σ = 295304940. Its totient is φ = 191974464.

The previous prime is 243023821. The next prime is 243023861. The reversal of 243023845 is 548320342.

It can be written as a sum of positive squares in 2 ways, for example, as 66080641 + 176943204 = 8129^2 + 13302^2 .

It is a de Polignac number, because none of the positive numbers 2^k-243023845 is a prime.

It is a super-3 number, since 3×243023845³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328486 + ... + 329224.

It is an arithmetic number, because the mean of its divisors is an integer number (24608745).

Almost surely, 2^243023845 is an apocalyptic number.

It is an amenable number.

243023845 is a deficient number, since it is larger than the sum of its proper divisors (52281095).

243023845 is an frugal number, since it uses more digits than its factorization.

243023845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 243023845 is about 15589.2220780897. Note that the first 3 decimals coincide. The cubic root of 243023845 is about 624.0455576055.

The spelling of 243023845 in words is "two hundred forty-three million, twenty-three thousand, eight hundred forty-five".