399222013 has 2 divisors, whose sum is σ = 399222014. Its totient is φ = 399222012.

The previous prime is 399222011. The next prime is 399222041. The reversal of 399222013 is 310222993.

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., 391921209 + 7300804 = 19797^2 + 2702^2 .

It is an emirp because it is prime and its reverse (310222993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399222013 - 2¹ = 399222011 is a prime.

Together with 399222011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399222011) 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 as a sum of consecutive naturals, namely, 199611006 + 199611007.

It is an arithmetic number, because the mean of its divisors is an integer number (199611007).

Almost surely, 2^399222013 is an apocalyptic number.

It is an amenable number.

399222013 is a deficient number, since it is larger than the sum of its proper divisors (1).

399222013 is an equidigital number, since it uses as much as digits as its factorization.

399222013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 399222013 is about 19980.5408585453. The cubic root of 399222013 is about 736.3283015948.

The spelling of 399222013 in words is "three hundred ninety-nine million, two hundred twenty-two thousand, thirteen".