399877849326916 has 27 divisors (see below), whose sum is σ = 719213205326679. Its totient is φ = 194534450052768.

The previous prime is 399877849326913. The next prime is 399877849326961. The reversal of 399877849326916 is 619623948778993.

The square root of 399877849326916 is 19996946.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 171913267864900 + 227964581462016 = 13111570^2 + 15098496^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399877849326913) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1479638890 + ... + 1479909118.

Almost surely, 2^{399877849326916} is an apocalyptic number.

399877849326916 is the 19996946-th square number.

It is an amenable number.

399877849326916 is a deficient number, since it is larger than the sum of its proper divisors (319335355999763).

399877849326916 is an frugal number, since it uses more digits than its factorization.

399877849326916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540536 (or 270268 counting only the distinct ones).

The product of its digits is 53331167232, while the sum is 91.

The spelling of 399877849326916 in words is "three hundred ninety-nine trillion, eight hundred seventy-seven billion, eight hundred forty-nine million, three hundred twenty-six thousand, nine hundred sixteen".