243056639 has 8 divisors (see below), whose sum is σ = 281584800. Its totient is φ = 205479936.

The previous prime is 243056623. The next prime is 243056659. The reversal of 243056639 is 936650342.

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 243056639 - 2⁴ = 243056623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243056659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237314 + ... + 238335.

It is an arithmetic number, because the mean of its divisors is an integer number (35198100).

Almost surely, 2^243056639 is an apocalyptic number.

243056639 is a deficient number, since it is larger than the sum of its proper divisors (38528161).

243056639 is an equidigital number, since it uses as much as digits as its factorization.

243056639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475729.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 243056639 is about 15590.2738590443. The cubic root of 243056639 is about 624.0736262223.

The spelling of 243056639 in words is "two hundred forty-three million, fifty-six thousand, six hundred thirty-nine".