243876781 has 8 divisors (see below), whose sum is σ = 258672960. Its totient is φ = 229130688.

The previous prime is 243876727. The next prime is 243876791. The reversal of 243876781 is 187678342.

243876781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 243876781 - 2¹³ = 243868589 is a prime.

It is a super-2 number, since 2×243876781² = 118951768621843922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243876701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2241 + ... + 22198.

It is an arithmetic number, because the mean of its divisors is an integer number (32334120).

Almost surely, 2^243876781 is an apocalyptic number.

It is an amenable number.

243876781 is a deficient number, since it is larger than the sum of its proper divisors (14796179).

243876781 is a wasteful number, since it uses less digits than its factorization.

243876781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25043.

The product of its digits is 451584, while the sum is 46.

The square root of 243876781 is about 15616.5547096663. The cubic root of 243876781 is about 624.7747719655.

The spelling of 243876781 in words is "two hundred forty-three million, eight hundred seventy-six thousand, seven hundred eighty-one".