238618881 has 24 divisors (see below), whose sum is σ = 350438400. Its totient is φ = 156440736.

The previous prime is 238618867. The next prime is 238618909. The reversal of 238618881 is 188816832.

238618881 is a `hidden beast` number, since 23 + 8 + 618 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 238618881 - 2⁷ = 238618753 is a prime.

It is a super-2 number, since 2×238618881² = 113877940739384322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (238618801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142656 + ... + 144318.

It is an arithmetic number, because the mean of its divisors is an integer number (14601600).

Almost surely, 2^238618881 is an apocalyptic number.

It is an amenable number.

238618881 is a deficient number, since it is larger than the sum of its proper divisors (111819519).

238618881 is a wasteful number, since it uses less digits than its factorization.

238618881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925 (or 1922 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 238618881 is about 15447.2936464612. The cubic root of 238618881 is about 620.2521355701.

The spelling of 238618881 in words is "two hundred thirty-eight million, six hundred eighteen thousand, eight hundred eighty-one".