399343934929 has 2 divisors, whose sum is σ = 399343934930. Its totient is φ = 399343934928.

The previous prime is 399343934909. The next prime is 399343934939. The reversal of 399343934929 is 929439343993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223487835025 + 175856099904 = 472745^2 + 419352^2 .

It is an emirp because it is prime and its reverse (929439343993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399343934929 - 2⁹ = 399343934417 is a prime.

It is not a weakly prime, because it can be changed into another prime (399343934909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199671967464 + 199671967465.

It is an arithmetic number, because the mean of its divisors is an integer number (199671967465).

Almost surely, 2^399343934929 is an apocalyptic number.

It is an amenable number.

399343934929 is a deficient number, since it is larger than the sum of its proper divisors (1).

399343934929 is an equidigital number, since it uses as much as digits as its factorization.

399343934929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153055008, while the sum is 67.

The spelling of 399343934929 in words is "three hundred ninety-nine billion, three hundred forty-three million, nine hundred thirty-four thousand, nine hundred twenty-nine".