238385781 has 16 divisors (see below), whose sum is σ = 373939200. Its totient is φ = 149575104.

The previous prime is 238385737. The next prime is 238385789. The reversal of 238385781 is 187583832.

It is not a de Polignac number, because 238385781 - 2⁶ = 238385717 is a prime.

It is a super-2 number, since 2×238385781² = 113655561165959922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238385789) 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 15 ways as a sum of consecutive naturals, for example, 259221 + ... + 260138.

It is an arithmetic number, because the mean of its divisors is an integer number (23371200).

Almost surely, 2^238385781 is an apocalyptic number.

It is an amenable number.

238385781 is a deficient number, since it is larger than the sum of its proper divisors (135553419).

238385781 is a wasteful number, since it uses less digits than its factorization.

238385781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519385 (or 519379 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 238385781 is about 15439.7467919652. The cubic root of 238385781 is about 620.0501008768.

The spelling of 238385781 in words is "two hundred thirty-eight million, three hundred eighty-five thousand, seven hundred eighty-one".