238865831 has 2 divisors, whose sum is σ = 238865832. Its totient is φ = 238865830.

The previous prime is 238865789. The next prime is 238865863. The reversal of 238865831 is 138568832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238865831 - 2¹⁴ = 238849447 is a prime.

It is a super-2 number, since 2×238865831² = 114113770438641122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238862831) 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 as a sum of consecutive naturals, namely, 119432915 + 119432916.

It is an arithmetic number, because the mean of its divisors is an integer number (119432916).

Almost surely, 2^238865831 is an apocalyptic number.

238865831 is a deficient number, since it is larger than the sum of its proper divisors (1).

238865831 is an equidigital number, since it uses as much as digits as its factorization.

238865831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 44.

The square root of 238865831 is about 15455.2848889951. The cubic root of 238865831 is about 620.4660309876.

The spelling of 238865831 in words is "two hundred thirty-eight million, eight hundred sixty-five thousand, eight hundred thirty-one".