393444313 has 4 divisors (see below), whose sum is σ = 393518500. Its totient is φ = 393370128.

The previous prime is 393444283. The next prime is 393444353. The reversal of 393444313 is 313444393.

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 91623184 + 301821129 = 9572^2 + 17373^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393444313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393444353) 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, 28470 + ... + 39967.

It is an arithmetic number, because the mean of its divisors is an integer number (98379625).

Almost surely, 2^393444313 is an apocalyptic number.

It is an amenable number.

393444313 is a deficient number, since it is larger than the sum of its proper divisors (74187).

393444313 is an equidigital number, since it uses as much as digits as its factorization.

393444313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74186.

The product of its digits is 46656, while the sum is 34.

The square root of 393444313 is about 19835.4307490410. The cubic root of 393444313 is about 732.7588809546.

The spelling of 393444313 in words is "three hundred ninety-three million, four hundred forty-four thousand, three hundred thirteen".