399906803 has 2 divisors, whose sum is σ = 399906804. Its totient is φ = 399906802.

The previous prime is 399906799. The next prime is 399906809. The reversal of 399906803 is 308609993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399906803 - 2² = 399906799 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399906809) 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, 199953401 + 199953402.

It is an arithmetic number, because the mean of its divisors is an integer number (199953402).

Almost surely, 2^399906803 is an apocalyptic number.

399906803 is a deficient number, since it is larger than the sum of its proper divisors (1).

399906803 is an equidigital number, since it uses as much as digits as its factorization.

399906803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 399906803 is about 19997.6699392704. The cubic root of 399906803 is about 736.7490718360.

The spelling of 399906803 in words is "three hundred ninety-nine million, nine hundred six thousand, eight hundred three".