243967381 has 16 divisors (see below), whose sum is σ = 288649216. Its totient is φ = 201833856.

The previous prime is 243967363. The next prime is 243967393. The reversal of 243967381 is 183769342.

243967381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243967381 - 2⁵ = 243967349 is a prime.

It is a super-2 number, since 2×243967381² = 119040165983998322, 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 (243967351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29185 + ... + 36601.

It is an arithmetic number, because the mean of its divisors is an integer number (18040576).

Almost surely, 2^243967381 is an apocalyptic number.

It is an amenable number.

243967381 is a deficient number, since it is larger than the sum of its proper divisors (44681835).

243967381 is a wasteful number, since it uses less digits than its factorization.

243967381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7588.

The product of its digits is 217728, while the sum is 43.

The square root of 243967381 is about 15619.4552081691. The cubic root of 243967381 is about 624.8521301380.

The spelling of 243967381 in words is "two hundred forty-three million, nine hundred sixty-seven thousand, three hundred eighty-one".