399685304 has 8 divisors (see below), whose sum is σ = 749409960. Its totient is φ = 199842648.

The previous prime is 399685303. The next prime is 399685313. The reversal of 399685304 is 403586993.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399685303) 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, 24980324 + ... + 24980339.

It is an arithmetic number, because the mean of its divisors is an integer number (93676245).

Almost surely, 2^399685304 is an apocalyptic number.

It is an amenable number.

399685304 is a deficient number, since it is larger than the sum of its proper divisors (349724656).

399685304 is a wasteful number, since it uses less digits than its factorization.

399685304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49960669 (or 49960665 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 399685304 is about 19992.1310519914. The cubic root of 399685304 is about 736.6130240372.

The spelling of 399685304 in words is "three hundred ninety-nine million, six hundred eighty-five thousand, three hundred four".