399706816 has 28 divisors (see below), whose sum is σ = 798975288. Its totient is φ = 198390272.

The previous prime is 399706799. The next prime is 399706817. The reversal of 399706816 is 618607993.

It is a self number, because there is not a number n which added to its sum of digits gives 399706816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399706817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14026 + ... + 31561.

Almost surely, 2^399706816 is an apocalyptic number.

It is an amenable number.

399706816 is a deficient number, since it is larger than the sum of its proper divisors (399268472).

399706816 is a wasteful number, since it uses less digits than its factorization.

399706816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45736 (or 45726 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 399706816 is about 19992.6690564317. The cubic root of 399706816 is about 736.6262392134.

The spelling of 399706816 in words is "three hundred ninety-nine million, seven hundred six thousand, eight hundred sixteen".