338581813 has 4 divisors (see below), whose sum is σ = 346839948. Its totient is φ = 330323680.

The previous prime is 338581801. The next prime is 338581819. The reversal of 338581813 is 318185833.

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

It can be written as a sum of positive squares in 2 ways, for example, as 140138244 + 198443569 = 11838^2 + 14087^2 .

It is a cyclic number.

It is not a de Polignac number, because 338581813 - 2⁹ = 338581301 is a prime.

It is a super-2 number, since 2×338581813² = 229275288188733938, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (338581819) 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, 4129006 + ... + 4129087.

It is an arithmetic number, because the mean of its divisors is an integer number (86709987).

Almost surely, 2^338581813 is an apocalyptic number.

It is an amenable number.

338581813 is a deficient number, since it is larger than the sum of its proper divisors (8258135).

338581813 is an equidigital number, since it uses as much as digits as its factorization.

338581813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8258134.

The product of its digits is 69120, while the sum is 40.

The square root of 338581813 is about 18400.5927350181. The cubic root of 338581813 is about 696.9814325377.

The spelling of 338581813 in words is "three hundred thirty-eight million, five hundred eighty-one thousand, eight hundred thirteen".