243987447 has 16 divisors (see below), whose sum is σ = 357691392. Its totient is φ = 146704320.

The previous prime is 243987439. The next prime is 243987449. The reversal of 243987447 is 744789342.

It is not a de Polignac number, because 243987447 - 2³ = 243987439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243987396 and 243987405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243987449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24918 + ... + 33299.

It is an arithmetic number, because the mean of its divisors is an integer number (22355712).

Almost surely, 2^243987447 is an apocalyptic number.

243987447 is a deficient number, since it is larger than the sum of its proper divisors (113703945).

243987447 is a wasteful number, since it uses less digits than its factorization.

243987447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58358.

The product of its digits is 1354752, while the sum is 48.

The square root of 243987447 is about 15620.0975349068. The cubic root of 243987447 is about 624.8692607602.

The spelling of 243987447 in words is "two hundred forty-three million, nine hundred eighty-seven thousand, four hundred forty-seven".