238978831 has 12 divisors (see below), whose sum is σ = 299380872. Its totient is φ = 189081648.

The previous prime is 238978823. The next prime is 238978847. The reversal of 238978831 is 138879832.

It is not a de Polignac number, because 238978831 - 2³ = 238978823 is a prime.

It is a super-2 number, since 2×238978831² = 114221763332253122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238978891) 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, 186945 + ... + 188218.

It is an arithmetic number, because the mean of its divisors is an integer number (24948406).

Almost surely, 2^238978831 is an apocalyptic number.

238978831 is a deficient number, since it is larger than the sum of its proper divisors (60402041).

238978831 is a wasteful number, since it uses less digits than its factorization.

238978831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375190 (or 375183 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 238978831 is about 15458.9401641898. The cubic root of 238978831 is about 620.5638566276.

The spelling of 238978831 in words is "two hundred thirty-eight million, nine hundred seventy-eight thousand, eight hundred thirty-one".