243726881 has 8 divisors (see below), whose sum is σ = 256137024. Its totient is φ = 231623280.

The previous prime is 243726871. The next prime is 243726893. The reversal of 243726881 is 188627342.

243726881 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 243726881 - 2¹⁰ = 243725857 is a prime.

It is a super-2 number, since 2×243726881² = 118805585043976322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243726811) 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, 75005 + ... + 78186.

It is an arithmetic number, because the mean of its divisors is an integer number (32017128).

Almost surely, 2^243726881 is an apocalyptic number.

It is an amenable number.

243726881 is a deficient number, since it is larger than the sum of its proper divisors (12410143).

243726881 is a wasteful number, since it uses less digits than its factorization.

243726881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153271.

The product of its digits is 129024, while the sum is 41.

The square root of 243726881 is about 15611.7545778814. The cubic root of 243726881 is about 624.6467388214.

The spelling of 243726881 in words is "two hundred forty-three million, seven hundred twenty-six thousand, eight hundred eighty-one".