243623745 has 24 divisors (see below), whose sum is σ = 426642216. Its totient is φ = 128590848.

The previous prime is 243623717. The next prime is 243623773. The reversal of 243623745 is 547326342.

243623745 is a `hidden beast` number, since 24 + 3 + 623 + 7 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (243623717) and next prime (243623773).

It can be written as a sum of positive squares in 4 ways, for example, as 29030544 + 214593201 = 5388^2 + 14649^2 .

It is not a de Polignac number, because 243623745 - 2¹⁰ = 243622721 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 23542 + ... + 32271.

It is an arithmetic number, because the mean of its divisors is an integer number (17776759).

Almost surely, 2^243623745 is an apocalyptic number.

It is an amenable number.

243623745 is a deficient number, since it is larger than the sum of its proper divisors (183018471).

243623745 is a wasteful number, since it uses less digits than its factorization.

243623745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55921 (or 55918 counting only the distinct ones).

The product of its digits is 120960, while the sum is 36.

The square root of 243623745 is about 15608.4510762599. The cubic root of 243623745 is about 624.5586174303.

The spelling of 243623745 in words is "two hundred forty-three million, six hundred twenty-three thousand, seven hundred forty-five".