243830891 has 4 divisors (see below), whose sum is σ = 245384112. Its totient is φ = 242277672.

The previous prime is 243830837. The next prime is 243830921. The reversal of 243830891 is 198038342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243830891 - 2¹⁰ = 243829867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243830491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776375 + ... + 776688.

It is an arithmetic number, because the mean of its divisors is an integer number (61346028).

Almost surely, 2^243830891 is an apocalyptic number.

243830891 is a deficient number, since it is larger than the sum of its proper divisors (1553221).

243830891 is a wasteful number, since it uses less digits than its factorization.

243830891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553220.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 243830891 is about 15615.0853664013. The cubic root of 243830891 is about 624.7355818019.

The spelling of 243830891 in words is "two hundred forty-three million, eight hundred thirty thousand, eight hundred ninety-one".