399305143 has 2 divisors, whose sum is σ = 399305144. Its totient is φ = 399305142.

The previous prime is 399305087. The next prime is 399305149. The reversal of 399305143 is 341503993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399305143 - 2¹⁷ = 399174071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399305149) 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, 199652571 + 199652572.

It is an arithmetic number, because the mean of its divisors is an integer number (199652572).

Almost surely, 2^399305143 is an apocalyptic number.

399305143 is a deficient number, since it is larger than the sum of its proper divisors (1).

399305143 is an equidigital number, since it uses as much as digits as its factorization.

399305143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 399305143 is about 19982.6210242801. The cubic root of 399305143 is about 736.3794065953.

The spelling of 399305143 in words is "three hundred ninety-nine million, three hundred five thousand, one hundred forty-three".