238431891 has 4 divisors (see below), whose sum is σ = 317909192. Its totient is φ = 158954592.

The previous prime is 238431889. The next prime is 238431913. The reversal of 238431891 is 198134832.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 238431891 - 2¹ = 238431889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238431841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39738646 + ... + 39738651.

It is an arithmetic number, because the mean of its divisors is an integer number (79477298).

Almost surely, 2^238431891 is an apocalyptic number.

238431891 is a deficient number, since it is larger than the sum of its proper divisors (79477301).

238431891 is an equidigital number, since it uses as much as digits as its factorization.

238431891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79477300.

The product of its digits is 41472, while the sum is 39.

The square root of 238431891 is about 15441.2399437351. The cubic root of 238431891 is about 620.0900762294.

The spelling of 238431891 in words is "two hundred thirty-eight million, four hundred thirty-one thousand, eight hundred ninety-one".