399404019648 has 56 divisors (see below), whose sum is σ = 1112375240320. Its totient is φ = 126127584000.

The previous prime is 399404019593. The next prime is 399404019689. The reversal of 399404019648 is 846910404993.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54739228 + ... + 54746523.

Almost surely, 2^399404019648 is an apocalyptic number.

399404019648 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

399404019648 is an abundant number, since it is smaller than the sum of its proper divisors (712971220672).

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

399404019648 is a wasteful number, since it uses less digits than its factorization.

399404019648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109485785 (or 109485775 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 399404019648 in words is "three hundred ninety-nine billion, four hundred four million, nineteen thousand, six hundred forty-eight".