243980615 has 16 divisors (see below), whose sum is σ = 308766720. Its totient is φ = 184563360.

The previous prime is 243980609. The next prime is 243980641. The reversal of 243980615 is 516089342.

It is a happy number.

It is not a de Polignac number, because 243980615 - 2¹⁸ = 243718471 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55550 + ... + 59780.

It is an arithmetic number, because the mean of its divisors is an integer number (19297920).

Almost surely, 2^243980615 is an apocalyptic number.

243980615 is a deficient number, since it is larger than the sum of its proper divisors (64786105).

243980615 is a wasteful number, since it uses less digits than its factorization.

243980615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 243980615 is about 15619.8788407593. The cubic root of 243980615 is about 624.8634282926.

The spelling of 243980615 in words is "two hundred forty-three million, nine hundred eighty thousand, six hundred fifteen".