243505378 has 4 divisors (see below), whose sum is σ = 365258070. Its totient is φ = 121752688.

The previous prime is 243505337. The next prime is 243505421. The reversal of 243505378 is 873505342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873505342 = 2 ⋅436752671.

It can be written as a sum of positive squares in only one way, i.e., 125283249 + 118222129 = 11193^2 + 10873^2 .

It is a super-2 number, since 2×243505378² = 118589738229845768, which contains 22 as substring.

It is an unprimeable number.

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, 60876343 + ... + 60876346.

Almost surely, 2^243505378 is an apocalyptic number.

243505378 is a deficient number, since it is larger than the sum of its proper divisors (121752692).

243505378 is a wasteful number, since it uses less digits than its factorization.

243505378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121752691.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 243505378 is about 15604.6588556110. The cubic root of 243505378 is about 624.4574517225.

The spelling of 243505378 in words is "two hundred forty-three million, five hundred five thousand, three hundred seventy-eight".