399319013 has 6 divisors (see below), whose sum is σ = 406998354. Its totient is φ = 391781936.

The previous prime is 399318989. The next prime is 399319033. The reversal of 399319013 is 310913993.

It can be written as a sum of positive squares in 3 ways, for example, as 25786084 + 373532929 = 5078^2 + 19327^2 .

It is not a de Polignac number, because 399319013 - 2¹² = 399314917 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 (399319033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68270 + ... + 73887.

It is an arithmetic number, because the mean of its divisors is an integer number (67833059).

Almost surely, 2^399319013 is an apocalyptic number.

It is an amenable number.

399319013 is a deficient number, since it is larger than the sum of its proper divisors (7679341).

399319013 is an equidigital number, since it uses as much as digits as its factorization.

399319013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142263 (or 142210 counting only the distinct ones).

The product of its (nonzero) digits is 19683, while the sum is 38.

The square root of 399319013 is about 19982.9680728364. The cubic root of 399319013 is about 736.3879326264.

The spelling of 399319013 in words is "three hundred ninety-nine million, three hundred nineteen thousand, thirteen".