399303994 has 16 divisors (see below), whose sum is σ = 618773760. Its totient is φ = 193056480.

The previous prime is 399303967. The next prime is 399304001. The reversal of 399303994 is 499303993.

It is a happy number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 127977 + ... + 131059.

It is an arithmetic number, because the mean of its divisors is an integer number (38673360).

Almost surely, 2^399303994 is an apocalyptic number.

399303994 is a deficient number, since it is larger than the sum of its proper divisors (219469766).

399303994 is a wasteful number, since it uses less digits than its factorization.

399303994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205.

The product of its (nonzero) digits is 708588, while the sum is 49.

The square root of 399303994 is about 19982.5922742771. The cubic root of 399303994 is about 736.3787002844.

Subtracting 399303994 from its reverse (499303993), we obtain a palindrome (99999999).

The spelling of 399303994 in words is "three hundred ninety-nine million, three hundred three thousand, nine hundred ninety-four".