238955813 has 4 divisors (see below), whose sum is σ = 239508108. Its totient is φ = 238403520.

The previous prime is 238955807. The next prime is 238955819. The reversal of 238955813 is 318559832.

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

It is an interprime number because it is at equal distance from previous prime (238955807) and next prime (238955819).

It can be written as a sum of positive squares in 2 ways, for example, as 74269924 + 164685889 = 8618^2 + 12833^2 .

It is a cyclic number.

It is not a de Polignac number, because 238955813 - 2¹⁸ = 238693669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238955819) 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, 275498 + ... + 276363.

It is an arithmetic number, because the mean of its divisors is an integer number (59877027).

Almost surely, 2^238955813 is an apocalyptic number.

It is an amenable number.

238955813 is a deficient number, since it is larger than the sum of its proper divisors (552295).

238955813 is an equidigital number, since it uses as much as digits as its factorization.

238955813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552294.

The product of its digits is 259200, while the sum is 44.

The square root of 238955813 is about 15458.1956579673. The cubic root of 238955813 is about 620.5439321327.

The spelling of 238955813 in words is "two hundred thirty-eight million, nine hundred fifty-five thousand, eight hundred thirteen".