243980983 has 4 divisors (see below), whose sum is σ = 245535160. Its totient is φ = 242426808.

The previous prime is 243980977. The next prime is 243981041. The reversal of 243980983 is 389089342.

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 243980983 - 2²⁵ = 210426551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243980903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776853 + ... + 777166.

It is an arithmetic number, because the mean of its divisors is an integer number (61383790).

Almost surely, 2^243980983 is an apocalyptic number.

243980983 is a deficient number, since it is larger than the sum of its proper divisors (1554177).

243980983 is a wasteful number, since it uses less digits than its factorization.

243980983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554176.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 243980983 is about 15619.8906206158. The cubic root of 243980983 is about 624.8637424564.

The spelling of 243980983 in words is "two hundred forty-three million, nine hundred eighty thousand, nine hundred eighty-three".