243378634 has 4 divisors (see below), whose sum is σ = 365067954. Its totient is φ = 121689316.

The previous prime is 243378631. The next prime is 243378671. The reversal of 243378634 is 436873342.

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

It can be written as a sum of positive squares in only one way, i.e., 243266409 + 112225 = 15597^2 + 335^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (243378631) 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 as a sum of consecutive naturals, namely, 60844657 + ... + 60844660.

Almost surely, 2^243378634 is an apocalyptic number.

243378634 is a deficient number, since it is larger than the sum of its proper divisors (121689320).

243378634 is a wasteful number, since it uses less digits than its factorization.

243378634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121689319.

The product of its digits is 290304, while the sum is 40.

The square root of 243378634 is about 15600.5972321575. The cubic root of 243378634 is about 624.3490900213.

The spelling of 243378634 in words is "two hundred forty-three million, three hundred seventy-eight thousand, six hundred thirty-four".