399706799 has 2 divisors, whose sum is σ = 399706800. Its totient is φ = 399706798.

The previous prime is 399706787. The next prime is 399706817. The reversal of 399706799 is 997607993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399706799 - 2¹² = 399702703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399706729) 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, 199853399 + 199853400.

It is an arithmetic number, because the mean of its divisors is an integer number (199853400).

Almost surely, 2^399706799 is an apocalyptic number.

399706799 is a deficient number, since it is larger than the sum of its proper divisors (1).

399706799 is an equidigital number, since it uses as much as digits as its factorization.

399706799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5786802, while the sum is 59.

The square root of 399706799 is about 19992.6686312758. The cubic root of 399706799 is about 736.6262287702.

The spelling of 399706799 in words is "three hundred ninety-nine million, seven hundred six thousand, seven hundred ninety-nine".