238820143 has 4 divisors (see below), whose sum is σ = 238852800. Its totient is φ = 238787488.

The previous prime is 238820137. The next prime is 238820147. The reversal of 238820143 is 341028832.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 238820143 - 2⁹ = 238819631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238820147) 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, 258 + ... + 21856.

It is an arithmetic number, because the mean of its divisors is an integer number (59713200).

Almost surely, 2^238820143 is an apocalyptic number.

238820143 is a deficient number, since it is larger than the sum of its proper divisors (32657).

238820143 is a wasteful number, since it uses less digits than its factorization.

238820143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32656.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 238820143 is about 15453.8067478534. The cubic root of 238820143 is about 620.4264695045.

Adding to 238820143 its reverse (341028832), we get a palindrome (579848975).

The spelling of 238820143 in words is "two hundred thirty-eight million, eight hundred twenty thousand, one hundred forty-three".