243801947 has 4 divisors (see below), whose sum is σ = 258143256. Its totient is φ = 229460640.

The previous prime is 243801941. The next prime is 243801967. The reversal of 243801947 is 749108342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749108342 = 2 ⋅374554171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243801947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243801947.

It is not an unprimeable number, because it can be changed into a prime (243801941) 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, 7170629 + ... + 7170662.

It is an arithmetic number, because the mean of its divisors is an integer number (64535814).

Almost surely, 2^243801947 is an apocalyptic number.

243801947 is a deficient number, since it is larger than the sum of its proper divisors (14341309).

243801947 is a wasteful number, since it uses less digits than its factorization.

243801947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14341308.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 243801947 is about 15614.1585428098. The cubic root of 243801947 is about 624.7108610318.

The spelling of 243801947 in words is "two hundred forty-three million, eight hundred one thousand, nine hundred forty-seven".