238784813 has 2 divisors, whose sum is σ = 238784814. Its totient is φ = 238784812.

The previous prime is 238784809. The next prime is 238784921. The reversal of 238784813 is 318487832.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237838084 + 946729 = 15422^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 238784813 - 2² = 238784809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238784213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119392406 + 119392407.

It is an arithmetic number, because the mean of its divisors is an integer number (119392407).

Almost surely, 2^238784813 is an apocalyptic number.

It is an amenable number.

238784813 is a deficient number, since it is larger than the sum of its proper divisors (1).

238784813 is an equidigital number, since it uses as much as digits as its factorization.

238784813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 44.

The square root of 238784813 is about 15452.6636215249. The cubic root of 238784813 is about 620.3958736094.

The spelling of 238784813 in words is "two hundred thirty-eight million, seven hundred eighty-four thousand, eight hundred thirteen".