399290863 has 2 divisors, whose sum is σ = 399290864. Its totient is φ = 399290862.

The previous prime is 399290861. The next prime is 399290867. The reversal of 399290863 is 368092993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399290863 - 2¹ = 399290861 is a prime.

Together with 399290861, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399290861) 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, 199645431 + 199645432.

It is an arithmetic number, because the mean of its divisors is an integer number (199645432).

Almost surely, 2^399290863 is an apocalyptic number.

399290863 is a deficient number, since it is larger than the sum of its proper divisors (1).

399290863 is an equidigital number, since it uses as much as digits as its factorization.

399290863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 399290863 is about 19982.2637106010. The cubic root of 399290863 is about 736.3706283268.

The spelling of 399290863 in words is "three hundred ninety-nine million, two hundred ninety thousand, eight hundred sixty-three".