243987446 has 4 divisors (see below), whose sum is σ = 365981172. Its totient is φ = 121993722.

The previous prime is 243987439. The next prime is 243987449. The reversal of 243987446 is 644789342.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 243987446.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 60996860 + ... + 60996863.

It is an arithmetic number, because the mean of its divisors is an integer number (91495293).

Almost surely, 2^243987446 is an apocalyptic number.

243987446 is a deficient number, since it is larger than the sum of its proper divisors (121993726).

243987446 is a wasteful number, since it uses less digits than its factorization.

243987446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121993725.

The product of its digits is 1161216, while the sum is 47.

The square root of 243987446 is about 15620.0975028967. The cubic root of 243987446 is about 624.8692599065.

The spelling of 243987446 in words is "two hundred forty-three million, nine hundred eighty-seven thousand, four hundred forty-six".