399944011 has 2 divisors, whose sum is σ = 399944012. Its totient is φ = 399944010.

The previous prime is 399943991. The next prime is 399944021. The reversal of 399944011 is 110449993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399944011 - 2⁵ = 399943979 is a prime.

It is not a weakly prime, because it can be changed into another prime (399944021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199972005 + 199972006.

It is an arithmetic number, because the mean of its divisors is an integer number (199972006).

Almost surely, 2^399944011 is an apocalyptic number.

399944011 is a deficient number, since it is larger than the sum of its proper divisors (1).

399944011 is an equidigital number, since it uses as much as digits as its factorization.

399944011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 399944011 is about 19998.6002260158. The cubic root of 399944011 is about 736.7719205841.

The spelling of 399944011 in words is "three hundred ninety-nine million, nine hundred forty-four thousand, eleven".