399256078016 has 28 divisors (see below), whose sum is σ = 838878122088. Its totient is φ = 187885212672.

The previous prime is 399256077949. The next prime is 399256078021. The reversal of 399256078016 is 610870652993.

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 3 ways as a sum of consecutive naturals, for example, 183480566 + ... + 183482741.

Almost surely, 2^399256078016 is an apocalyptic number.

It is an amenable number.

399256078016 is an abundant number, since it is smaller than the sum of its proper divisors (439622044072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399256078016 is a wasteful number, since it uses less digits than its factorization.

399256078016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366963336 (or 366963326 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 399256078016 in words is "three hundred ninety-nine billion, two hundred fifty-six million, seventy-eight thousand, sixteen".