399991316896 has 24 divisors (see below), whose sum is σ = 787519548900. Its totient is φ = 199986352128.

The previous prime is 399991316891. The next prime is 399991316909. The reversal of 399991316896 is 698613199993.

It can be written as a sum of positive squares in 2 ways, for example, as 331734529296 + 68256787600 = 575964^2 + 261260^2 .

It is not an unprimeable number, because it can be changed into a prime (399991316891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435520 + ... + 994816.

Almost surely, 2^399991316896 is an apocalyptic number.

It is an amenable number.

399991316896 is a deficient number, since it is larger than the sum of its proper divisors (387528232004).

399991316896 is a wasteful number, since it uses less digits than its factorization.

399991316896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581656 (or 581648 counting only the distinct ones).

The product of its digits is 153055008, while the sum is 73.

The spelling of 399991316896 in words is "three hundred ninety-nine billion, nine hundred ninety-one million, three hundred sixteen thousand, eight hundred ninety-six".