238731138 has 20 divisors (see below), whose sum is σ = 534934950. Its totient is φ = 79576992.

The previous prime is 238731121. The next prime is 238731167. The reversal of 238731138 is 831137832.

238731138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 234916929 + 3814209 = 15327^2 + 1953^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 736663 + ... + 736986.

Almost surely, 2^238731138 is an apocalyptic number.

238731138 is an abundant number, since it is smaller than the sum of its proper divisors (296203812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

238731138 is a wasteful number, since it uses less digits than its factorization.

238731138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473663 (or 1473654 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 238731138 is about 15450.9267683204. The cubic root of 238731138 is about 620.3493851086.

The spelling of 238731138 in words is "two hundred thirty-eight million, seven hundred thirty-one thousand, one hundred thirty-eight".