238569831 has 12 divisors (see below), whose sum is σ = 355717440. Its totient is φ = 153915840.

The previous prime is 238569829. The next prime is 238569899. The reversal of 238569831 is 138965832.

It is a happy number.

238569831 is a `hidden beast` number, since 2 + 3 + 8 + 569 + 83 + 1 = 666.

238569831 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 238569831 - 2¹ = 238569829 is a prime.

It is a super-2 number, since 2×238569831² = 113831128526737122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238569811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 427266 + ... + 427823.

It is an arithmetic number, because the mean of its divisors is an integer number (29643120).

Almost surely, 2^238569831 is an apocalyptic number.

238569831 is a deficient number, since it is larger than the sum of its proper divisors (117147609).

238569831 is a wasteful number, since it uses less digits than its factorization.

238569831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855126 (or 855123 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 238569831 is about 15445.7059081157. The cubic root of 238569831 is about 620.2096334122.

The spelling of 238569831 in words is "two hundred thirty-eight million, five hundred sixty-nine thousand, eight hundred thirty-one".