243849859 has 4 divisors (see below), whose sum is σ = 266018040. Its totient is φ = 221681680.

The previous prime is 243849829. The next prime is 243849871. The reversal of 243849859 is 958948342.

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

It is not a de Polignac number, because 243849859 - 2¹³ = 243841667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243849829) 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 3 ways as a sum of consecutive naturals, for example, 11084074 + ... + 11084095.

It is an arithmetic number, because the mean of its divisors is an integer number (66504510).

Almost surely, 2^243849859 is an apocalyptic number.

243849859 is a deficient number, since it is larger than the sum of its proper divisors (22168181).

243849859 is a wasteful number, since it uses less digits than its factorization.

243849859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22168180.

The product of its digits is 2488320, while the sum is 52.

The square root of 243849859 is about 15615.6927159829. The cubic root of 243849859 is about 624.7517811129.

It can be divided in two parts, 24384 and 9859, that added together give a palindrome (34243).

The spelling of 243849859 in words is "two hundred forty-three million, eight hundred forty-nine thousand, eight hundred fifty-nine".