399840011 has 2 divisors, whose sum is σ = 399840012. Its totient is φ = 399840010.

The previous prime is 399839989. The next prime is 399840029. The reversal of 399840011 is 110048993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399840011 - 2²² = 395645707 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399846011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199920005 + 199920006.

It is an arithmetic number, because the mean of its divisors is an integer number (199920006).

Almost surely, 2^399840011 is an apocalyptic number.

399840011 is a deficient number, since it is larger than the sum of its proper divisors (1).

399840011 is an equidigital number, since it uses as much as digits as its factorization.

399840011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 399840011 is about 19995.9998749750. Note that the first 3 decimals coincide. The cubic root of 399840011 is about 736.7080525423.

The spelling of 399840011 in words is "three hundred ninety-nine million, eight hundred forty thousand, eleven".