243980781 has 8 divisors (see below), whose sum is σ = 354881184. Its totient is φ = 147867120.

The previous prime is 243980771. The next prime is 243980801. The reversal of 243980781 is 187089342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243980781 - 2⁵ = 243980749 is a prime.

It is a super-2 number, since 2×243980781² = 119053242994739922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243980731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696646 + ... + 3696711.

It is an arithmetic number, because the mean of its divisors is an integer number (44360148).

Almost surely, 2^243980781 is an apocalyptic number.

It is an amenable number.

243980781 is a deficient number, since it is larger than the sum of its proper divisors (110900403).

243980781 is a wasteful number, since it uses less digits than its factorization.

243980781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7393371.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 243980781 is about 15619.8841545000. The cubic root of 243980781 is about 624.8635700078.

The spelling of 243980781 in words is "two hundred forty-three million, nine hundred eighty thousand, seven hundred eighty-one".